In case this is useful to anyone, here comes the answer:
The reason is that the refresh token expires if inactive for 6 months -
which has been the case in what I described above.
source: https://developers.google.com/identity/protocols/oauth2#expiration
On Thursday, November 21, 2024 at 2:09:20 PM UTC+2 Alex Papageorgiou wrote:
> Hi everyone,
>
> After several years of seamless access to the API, I’ve suddenly started
> encountering the following error:
>
> RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant',
> 'error_description': 'Bad Request'})
>
> A few key points to note:
>
>
> - The publishing status has been set to In production since the
> beginning and hasn’t been changed.
> - I used the API regularly (at least once a week) for the past two
> years. However, I haven’t used it at all since April 2024, meaning there’s
> been over six months of inactivity.
> - No other settings have been altered, including those for the Cloud
> account, Google Ads MCC, etc.
>
>
> Here’s how my yaml file looks like, which I pass to client =
> GoogleAdsClient.load_from_storage()
>
> developer_token: xxxx.......
> client_id: xxxxx.......apps.googleusercontent.com
> client_secret: xxxx.......
> refresh_token: xxxxxxxx........
> use_proto_plus: True
>
> I’ve tested both version 16 of the API and the latest version, but neither
> worked.
>
> Were there any changes to the Google Ads API or OAuth processes over the
> past six months that might be causing this?
> I’d appreciate any guidance on how to solve this.
> Thank you,
> Alex
>
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