Google OAuth2 grant limitations
Is there a maximum number of oauth2 grants you can have from 1 google account to 1 client_id?
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jarcoal 
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Yes, but new grants are only added to explicit user consent options. Auto-confirmed events do not increase the number of grants, so there is no limit on the outstanding amount of tokens.
The maximum number of grants per client_id / user at this time is 25, and we are working to increase it.
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breno 
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