If the grant_type is authorization_code
You will get the invalid_code error when you try to reuse or use an expired code. The code value generated using /oauth/v2/auth is valid only for two minutes and is only one time usable.
If the grant_type is refresh_token
You will get an invalid_code error if the users have manually revoked their refresh token either during password reset or via Connected Apps, Devices sign-in. Refresh tokens don't expire unless you manually delete them.
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