Same problem happened.( Getting invalid_grant error when trying to refresh token)

[naotoshi.nishijima]

I had the same problem with the following topic.

Getting invalid_grant error when trying to refresh token

Description after getting 401 response with the {‘code’: 124, ‘message’: ‘Access token is expired.’} json I’m trying to refresh the user’s access token with previously got refresh token. I’m getting {error: ‘invalid_grant’, reason: ‘Invalid Token!’} as a response to the /oauth/token?grant_type=refresh_token&refresh_token=<refresh_token> request. Error is raised for a particular user connected via oauth, all other users work perfectly fine. I’ve seen topics with invalid_request error response…

What are the possible causes and solutions?

[donte.zoom (Donte)]

Welcome to the Developer Forum, @naotoshi.nishijima – thank you for posting! Generally, this error is triggered when the latest refresh token is not used in the request. To start, can you confirm if you are using the latest refresh token? Please note while a refresh token is validated for 15 years, it can only be used once.