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To check third-party access in your Google Account, go to:
Manage your Google Account
Secure account
Security Checkup - Third-party access
You should see any access there - for example, my Gmail account shows access to my Android (it's not Gmail) e-mail app.
My understanding of the OAuth process is that, when adding a Gmail account to your (not Gmail) e-mail app, you have to go through a verification process (a web page opens for you to complete the verification). If your app does not open a web page, it's probably an app that won't meet Google's standard.
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