There was a solution proposed here https://community.atlassian.com/forums/Trello-questions/Unable-to-Connect-Google-Drive-to-Trello-App-Blocked-Error/qaq-p/2856923
Hi @Matías
Verify that Trello access is permitted by your Google Drive sharing permissions if you are able to authenticate but still unable to access files. Depending on your use case, files must have "Anyone with the link" or at the very least "Anyone in your organization" permissions.
Kindly check the permissions once.
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