Re: API access token expired

If you're getting a "long-lived" access token (that is, it doesn't start with "sl." and is generally 64 characters long), that shouldn't expire by itself. 

• the user or team admin can revoke all access tokens for an app by unlinking it on any of the following Dropbox web pages:
• the Connected apps page
• the Security checkup page
• the Team apps page on the Settings section of Business Admin console
• the team member’s page on the Members section of the Business Admin console
• any client with the access token can revoke the access token by calling /2/auth/token/revoke
• the GitHub-Dropbox token scanning partnership can revoke access tokens found publicly posted on GitHub
• if the app uses the "app folder" permission, the access token can effectively be disabled by deleting the app folder itself in the Dropbox account, via the Dropbox website or any client
• the app can be disabled
• the account that owns the app can be disabled
• the connected account can be disabled

Please review the above possibilities for information on why your token may be invalid. If the Dropbox API isn't behaving as expected, feel free to contact support by opening an API ticket.