Intellij Plug in fails to sign in

[TheNormanCoder]

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Bug

Copilot Feature Area

JetBrains & Xcode

Body

Github Copilot plug in is not able to complete sign in

It opens browser and log in successfully:

But not logged in into the ide

here some log:

2026-01-22 08:21:07,618 [ 908355] INFO - #copilot - [default] PKCE supported by server with methods: [S256], using S256
2026-01-22 08:21:07,618 [ 908355] INFO - #copilot - [default] auth url: http://127.0.0.1:33428/signin?nonce=X8Ld1wWX2hz6XovUwXaTsA%3D%3D
2026-01-22 08:21:07,629 [ 908366] WARN - #com.github.copilot.lang.agent.vscodeRpc.CancellableAsyncPromise - Suppressed a frequent exception logged for the 50th time: Not signed in to Copilot agent
2026-01-22 08:21:15,600 [ 916337] WARN - #copilot - [OAuth Code Flow] Failed to fetch user info: Bad credentials
2026-01-22 08:21:15,626 [ 916363] INFO - #com.github.copilot.lang.agent.AgentGitHubService - OAuth code flow completed - status: NotSignedIn, user: null

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[proshin-roman]

I'd like to share that I faced this problem as well. Exactly the same lines in the idea.log: "Bad Credentials" after a redirect from GHE back to IDEA.

UPD: Just noticed that the original issue doesn't look like related to GitHub Enterprise, while I'm trying to log in to my company's Enterprise GitHub account. From how the error looks like, there is not much of a difference, but I better mention it here.

[vinodbavage31]

This issue usually happens when the GitHub Copilot plugin doesn’t correctly receive or persist the OAuth token after the browser login. The “Bad credentials” message in the IDE logs confirms that the authentication completed in the browser but didn’t make it back to the IDE.

Common workarounds:

Restart the IDE after logging in via the browser—it sometimes finalizes the token exchange.

Clear Copilot cache/config in JetBrains (Help → Show Log in Explorer → delete .copilot or related cache folders) and try signing in again.

Make sure your firewall or proxy isn’t blocking the localhost callback (127.0.0.1) that Copilot uses for OAuth.

If using GitHub Enterprise, confirm that your IDE plugin version supports your Enterprise instance URL and OAuth configuration.

If none of these work, this looks like a plugin-side OAuth handling issue, so reporting it with your logs (like you did) is the right approach.

[proshin-roman]

Unfortunately, nothing from the list has helped me resolve the issue. After clicking the "Log in" button in the IDEA Copilot extension, I am successfully redirected to my company's GitHub Enterprise instance. After signing in to my GHE account, I am redirected back to localhost, where I see a "success" message. However, the IDEA plugin is unable to obtain an access token.

In contrast, the Copilot CLI still uses the code-based authentication flow (where a code is copied from the terminal and pasted into the GHE login page), and this flow continues to work flawlessly. I would be happy to use the same approach in the IDEA plugin as well — copying and pasting a token occasionally is honestly not a big deal.

[TheNormanCoder]

I reported it in GitHub Enterprise also...the issue started with latest version.
In the older version, I had to digit the code to sign in and then return to the client usually.
With last version it's not happening anymore. It's a plug in side problem. Downgrading to older version it's no more happening .
As workaround I am using older versions of ide and plug in.