Google is in the process of verifying all of its third party apps to ensure valid data access. This is a good thing. However, in the process, they have screwed up AppSheet signin for a few users. If you are one of the unlucky few, you will see a scary screen when you try to sign into AppSheet, telling you there is “danger”, AppSheet is “unverified” and not to proceed. The root cause is that permissions you may have given us in the past are no longer valid, and when we try to sign you in, Google’s security system freaks out. This is a Google bug/weird behavior that we expect them to fix and expect to have this resolved with Google sometime on Monday. It is frustrating when they made this change on a Sunday.

In the interim, there are one of two things you can do:
a) If the warning screen has an Advanced option, you can click on that, and proceed with your sign in, ignoring their dire warnings. or …
b) You can follow the steps below …

  1. Go to

  2. Under “Third party apps with account access”, find AppSheet, click on it, and then “Remove Access”

  3. Go to and sign in via Google … this should now work.

  4. If you had set up any Google Calendar data source, or any Google Domain auth source, please go to your account page in AppSheet, find the appropriate Calendar data source or Domain auth source, click on its icon, and go thru its signin process once again.

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