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Hi, im getting invalid refresh token even though  the time of request is less than the expires_at time?

how are you sending the token? Have you used it earlier? refresh_tokens are single use.

oh. after a user signs in, i save the session on the client, then send the refresh_token to the server and refresh it

I don't think you need to do that, after login you should get a perfectly valid access_token

I guess i was trying to do it so that the user wont have to login again if the session expires