I wanted to share a fix for the issue where Google authorizations kept needing to be refreshed, even though the connections were previously working. The problem is also discussed here: Gmail module send emails stopped working, reauthorizing
To resolve it:
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Go to your app in Google Cloud Console.
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Navigate to OAuth 2.0 Client IDs under Credentials, then click Add Secret to generate a new client secret.
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In Make.com, go to your Connections, click Edit on the affected connection, and enter your Client ID and the new Client Secret.
This worked immediately for me—hope it helps someone else!