When a token has expired or has been revoked, it can no longer be used to authenticate Git and API requests. It is not possible to restore an expired or revoked token, you or the application will need to create a new token.
This article explains the possible reasons your GitHub token might be revoked or expire.
Note
When a personal access token or OAuth token expires or is revoked, you may see an oauth_authorization.destroy action in your security log. For more information, see "Reviewing your security log."
Token revoked after reaching its expiration date
When you create a personal access token, we recommend that you set an expiration for your token. Upon reaching your token's expiration date, the token is automatically revoked. For more information, see "Managing your personal access tokens."
Token revoked when pushed to a public repository or public gist
If a valid OAuth token, GitHub App token, or personal access token is pushed to a public repository or public gist, the token will be automatically revoked.
Token expired due to lack of use
GitHub will automatically revoke an OAuth token or personal access token when the token hasn't been used in one year.
Token revoked by the user
You can revoke your authorization of a GitHub App or OAuth app from your account settings which will revoke any tokens associated with the app. For more information, see "Reviewing and revoking authorization of GitHub Apps" and "Reviewing your authorized OAuth apps."
Once an authorization is revoked, any tokens associated with the authorization will be revoked as well. To reauthorize an application, follow the instructions from the third-party application or website to connect your account on GitHub again.
Token revoked by the OAuth app
The owner of an OAuth app can revoke an account's authorization of their app, this will also revoke any tokens associated with the authorization. For more information about revoking authorizations of your OAuth app, see "REST API endpoints for OAuth authorizations."
OAuth app owners can also revoke individual tokens associated with an authorization. For more information about revoking individual tokens for your OAuth app, see "REST API endpoints for OAuth authorizations."
Token revoked due to excess of tokens for an OAuth app with the same scope
There is a limit of ten tokens that are issued per user/application/scope combination, and a rate limit of ten tokens created per hour. If an application creates more than ten tokens for the same user and the same scopes, the oldest tokens with the same user/application/scope combination are revoked. However, hitting the hourly rate limit will not revoke your oldest token. Instead, it will trigger a re-authorization prompt within the browser, asking the user to double check the permissions they're granting your app. This prompt is intended to give a break to any potential infinite loop the app is stuck in, since there's little to no reason for an app to request ten tokens from the user within an hour.
User token expired due to GitHub App configuration
User access tokens created by a GitHub App will expire after eight hours by default, and then must be regenerated using the included refresh token. Owners of GitHub Apps can optionally configure these tokens to never expire instead, but this is not recommended due to the security implications. For more information about configuring your GitHub App's user access tokens, see "Activating optional features for GitHub Apps."