Hello,
Here is the couple of things that you could check that cause for that error.
- *Problem: *Refresh tokens can become invalid for a few reasons:
- There is a maximum of 25 refresh tokens that can be valid at a
time. If someone gets a 26th refresh token, then the 1st refresh token
becomes invalid.
- Refresh tokens can also be manually revoked. If someone left the
company, then they might have done so.
- *Solution:*
- Generate a new refresh token to be sure that it is valid.
- *Problem:* Your server is not synced time-wise with the Google server.
- *Solution: *Use NTP to make sure that the server is set to the correct
time.
Regards,
Umesh, AdWords API Team.
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