Thanks for the response. I spoke with my supervisor and he said the servers 
are synced. I dug deeper into our authorization process and we never 
re-request refresh tokens. We oauth once and refresh the access token if it 
has expired. Also, we are the only people with access to the accounts and 
no employees have left in the time period at hand nor did they have access 
to adwords. Generating a new access and refresh token requires manual 
intervention and until it is generated our app is broken for the client. 
When you say a maximum of 25 refresh tokens that can be valid at a time 
that is per user account correct?

On Monday, November 16, 2015 at 4:51:21 PM UTC-5, Umesh Dengale wrote:
>
> 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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