Authentification Error

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I launched Cursor in existing project, and for any sentence in agent chat received this messages “Authentication error.If you are logged in, try logging out and back in.” I repeated several times - Log out / Log in.

I can find no solution.

I have fully quit cursor, run diagnostics etc.

What do I do? I need to get back using it!

Steps to Reproduce

I don’t understand

Expected Behavior

Use cursor

Operating System

Windows 10/11

Version Information

Version: 3.18.9 (user setup)
VS Code Extension API: 1.128.0
Commit: 2ba48ff3f7514cc4643c52ca9f7b3173d9b66130
Date: 2026-08-27T01:42:22.092Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.291
OS: Windows_NT x64 10.0.26200

Does this stop you from using Cursor

Yes - Cursor is unusable

Hey @ANSRENTALS, thanks for the report, and sorry for the disruption.

Your account is in good standing and your sign-ins on the website are going through. It also looks like your most recent sign-in may have already taken, since a chat request went through successfully shortly after you posted. Can you confirm whether chat is working for you now?

Hi

I have no problem using Cursor in my browser at

I get the issue in the Cursor app that I use to edit my web site code.

I am logged in nut I keep getting the message below.

I am on the Pro plan and believe my payments are up to date. It was working fine until 24th August when I last used it but came back to it yesterday and now cannot access it.

Is uninstalling the app worth a try?

Regards

Michael

Authentication error.If you are logged in, try logging out and back in.”

Request ID: d3a84d19-b017-4cf3-b797-b0eb353b2030
{“error”:“ERROR_NOT_LOGGED_IN”,“details”:{“title”:“Authentication error”,“detail”:“If you are logged in, try logging out and back in.”,“isRetryable”:false,“additionalInfo”:{},“buttons”:,“planChoices”:,“analyticsMetadata”:{“actionRequired”:“login”}},“isExpected”:true}
Authentication error If you are logged in, try logging out and back in.
ActionRequiredError: Authentication error If you are logged in, try logging out and back in.
at wwf (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8042:131231)
at tqs (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8042:130070)
at Gwf (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8043:13645)
at Object.classify (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8043:17843)
at Uwf (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8043:5924)
at async pqs.run (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8043:17165)
at async fce.runAgentLoop (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8143:34413)
at async qIo.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:17461:15117)
at async qIo.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:17461:34036)
at async qIe._submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/MichaelBroomSmith/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8121:4529)

Hey Michael, thanks for the request ID, that helped a lot!

That request did reach our servers, and it shows exactly what is happening. The Cursor app on your PC is holding on to an old signed-in session that has expired, so every request it sends gets rejected, even though the app still shows you as logged in

Please try this:

  1. In Cursor, open Settings (gear icon in the top right), scroll to the bottom and Sign Out.
  2. Fully quit Cursor: right-click the Cursor icon in the Windows system tray (bottom right, near the clock) and choose Quit. Closing the window is not enough.
  3. Reopen Cursor and click Sign In.
  4. Complete the sign-in in your browser and wait for it to send you back into the Cursor app.
  5. Once you are back in the app, immediately send a short message in chat.

Let us know if that works!

Hi Colin

Thank you so much. That worked and was easy when you new how!!

Have a good day.

Super impressed by the support here.

Regards

Michael