Reasons for Uncertified Results in Duolingo English Test (DET)

What does Uncertified actually mean on the DET?

You paid $70. You sat for an hour. You waited 48 hours for your score. Then you saw the one word that meant your result was not usable. Uncertified. The result exists, but no university will accept it. Let us start with what that status actually means and what your options are next.

The Duolingo English Test has three possible end states for every attempt:

• Certified . the one you want. It means Duolingo's AI and human reviewers both signed off on your session, and your score is ready to send to universities.
• Uncertified . the status this article covers. It means the system flagged a rule violation serious enough to block your score from being released.
• Invalid . rarer. It usually means the test data did not upload or the session was terminated before completion, so no score was even produced.

Universities only see Certified results. An Uncertified attempt is invisible to admissions offices, which is the small mercy in all of this. But it costs you another $70 and another 48 hours of waiting if you want to try again.

The full reason tree: every reason your DET can be Uncertified

Every Uncertified result traces back to a trigger inside one of four root categories. Below is the full tree. The next sections go deep on each one, with the rule, the example, and the reason behind every trigger.

Category 1: identity and account issues

Identity is the first gate. If Duolingo cannot confirm you are who your account says you are, the result stays locked. The system checks your ID at the start of the test and again during human review. Most identity flags come from a mismatch you could have fixed in five minutes before you clicked start.

ID document problems.

• Blurry photo, expired passport, torn corner, and glare across the hologram all stop the automated screening
• The ID must be the original physical document. a photo on your phone, a scanned copy, or a photocopy is automatically rejected

Name mismatch between ID and DET account.

• Your DET account name must match your passport character for character
• Middle names, diacritics, transliterations, and married names all cause flags
• If your account says Maria Santos but your passport says Maria Juliana Santos-Pereira, the system blocks the result

Wrong ID type for your country.

• Most students use a passport, but accepted documents vary by country
• In India, only a valid passport is accepted. Aadhaar, PAN, voter ID, and student ID cards are all rejected
• Check the official accepted list at englishtest.duolingo.com/ids before test day

Multiple accounts or account sharing.

• Only one DET account allowed to buy, take, and send scores
• A second account, shared login, or testing under someone else's name voids the result and can lead to a permanent ban

Over the attempt limit.

• Up to 3 test attempts in any 30-day period
• Invalid and Uncertified attempts count against this limit
• Going over blocks further purchases

What room and lighting issues can make your DET Uncertified?

The webcam sees your room for the full hour. Anything it sees, the AI sees. In 2026, the DET is officially a two-camera exam. Your computer webcam handles one view. A smartphone or tablet, set up as a secondary camera, handles the other. If either camera flags a problem, your result is at risk.

Face and lighting.

• Your face must be clearly visible the entire time. No shadows, backlighting, or dim rooms.
• Glare on glasses counts as face obstruction; the system asks you to remove them at check-in.

Other people in the room.

• Anyone, even briefly. A child opening the door, a partner checking on you, or a pet crossing the desk has triggered flags.
• The room must be empty of other humans for the full hour.

Failed room or ear scan.

• The 360-degree scan is not optional. Show all four walls, the door, behind the monitor, and the desk surface.
• The ear scan happens during setup.
• Either scan rushed or incomplete equals a session rejected.

What desk and equipment issues can make your DET Uncertified?

Your desk surface and the audio equipment on it are scanned separately from the room itself. The AI looks for anything that could be used to cheat, distract, or break the rules, even if you never touch it. The safest approach is to start with a completely empty desk and only add the testing computer.

Prohibited items in view.

• Desk must be empty except for the testing computer. No paper, pens, notebooks, second monitor, phone (beyond the secondary camera), smartwatch, books, or headphones.
• A water bottle is borderline. If the AI cannot tell it from a phone, it flags you. Skip the drink during the test.

Headphones, earbuds, earplugs.

• Banned outright. No transparent, single-ear, or bone-conduction types.
• Built-in laptop speakers and microphone are the only allowed audio path.
• The AI verifies by asking you to show both ears during setup.

Category 3: behavior and proctoring AI signals

The AI watches what you do, not just what is in the room. This is the category that catches students who did everything else right but gave the system a reason to doubt them. The exact wording Duolingo uses on these flags is worth knowing, because the AI is consistent about the patterns it watches for.

Gaze and head pose.

• Gaze tracking is the most common behavior flag: looking away from the screen for an extended period triggers it
• Exact flag wording: "You looked away from the screen for an extended period of time."
• Glancing at the keyboard while typing is allowed; glancing at your phone, the wall, or a person off-camera is not
• Repeated head turns count the same as looking away

Speaking or mouthing during non-speaking tasks.

• Reading aloud, mouthing words during Listening, or whispering during Writing is all flagged
• Exact flag wording: "During the speaking section, it was evident you were reading a response that had been written out."

Suspicious typing patterns.

• Long pauses followed by fast typing bursts, copy-paste behaviour, or text matching other submissions all get flagged
• The AI compares your typing rhythm against expected human patterns

Browser focus and tab switching.

• Alt-tab, opening a new window, or a screen-recording tool activating all break the secure environment
• The system logs every focus loss

Face obstruction.

• Covering your mouth, ears, or face with hands or clothing at any point counts as obstruction
• The AI keeps watching after the setup scan ends

Category 4: technical, browser, and network issues

Some Uncertified results are not your fault. The test crashes, the internet drops, the camera stops working, and the system has no way to certify what it never fully received. These are the hardest flags to argue in an appeal, because Duolingo explicitly says you cannot appeal technical failures. You have to retake.

Unsupported device or operating system.

• You need a Windows or Mac laptop or desktop. Surface Pro in tablet mode, Chromebooks on managed profiles, and Linux are all rejected
• Virtual machines are detected; dual-monitor setups must be disconnected
• Run the system check inside the DET app 48 hours before, on the exact computer you will use

Wrong browser.

• The DET runs only in the current version of Google Chrome. Safari, Firefox, Edge, Brave, and outdated Chrome are blocked
• The DET desktop app is the safer option for writing sections

Network instability.

• A VPN, unstable Wi-Fi, ISP throttling, packet loss, or a mid-test drop can flag you
• Wired ethernet is the safer option
• Dropping for more than a few seconds can terminate the session and lose the attempt

Forbidden software.

• Grammarly, Zoom, Skype, Discord, Slack, WhatsApp, TeamViewer, AnyDesk, predictive text, auto-complete, and non-Latin input methods (e.g. Pinyin) all trigger flags
• The DET app forces a full system scan. close everything before you start

Hardware failure mid-test.

• Camera permission revoked by your OS, microphone hijacked by another app, or headphones still on the Bluetooth list
• Any of these can disable proctoring mid-session

The review and appeal process

You clicked submit. Now what. Every DET attempt goes through the same review pipeline:

• The AI scans the video first. If nothing looks wrong, the result goes straight to Certified within 48 hours
• If something looks off, a human reviewer pulls up the footage. The outcome is either an override (Certified) or a confirmation of the flag (Uncertified)

The appeal window is 72 hours from the moment you receive the Uncertified notice:

• After 72 hours, the button disappears and you cannot submit an appeal for that attempt
• Appeals are only available if your account is blocked or the invalid attempt consumed your test credit
• Technical failures are not eligible for appeal. you buy a new attempt and start over

The decision turnaround is 4 business days:

• An appeals specialist watches your full session and emails a final decision
• You get one appeal per test, and the decision is final. no second appeal, no escalation, no supervisor override

On the refund question:

• Duolingo does not refund Uncertified results caused by rule violations (headphones, name mismatch, background software)
• If the flag was a technical failure on Duolingo's end, they may grant a free retake within the original credit window

Quick-reference matrix: reason to trigger to fix

If you only have 30 seconds, scan this table. The full explanations and the why behind each trigger are in the sections above.

How Linguistic Academy helps you get a Certified DET score

You can spend 4 to 8 weeks on practice tests, vocabulary drills, and mock interviews. You can do every prep course on the market. Some Uncertified results still happen, because the test day setup is the part no course covers. The room. The equipment. The lighting. The secondary camera. The browser. The 360 scan you only get one chance to do right.

If your deadline is close, you probably do not have weeks to wait. And if the last attempt failed for a technical or environmental reason, doing the test again with the same setup will fail again the same way. The room and the equipment have to change.

Linguistic Academy takes a different path. An experienced professional works with you during your real test session. We handle the equipment and the technical setup. We prepare your system, position the secondary camera, and run the room scan with you. On test day, we are with you the full hour, so the room, the rules, and the proctoring AI never become your problem.

We have done this over 1,000 times across 30 countries. The success rate is 99.9 percent. If your target score and your deadline are not negotiable, this is the fastest path to a Certified result.

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