None of the ideas you gave worked, but thanks anyway. It resolved on its own, and if you encounter this issue, the solution is simply to wait — it gets fixed after 24 hours.
Gmail IMAP fail, need Oauth. Anyone can help?
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Hi, need some help about gmail IMAP. When I try the IMAP, it fails in BAS. It looks like that BAS has to add Oauth or some other ways. Anyone who can help to solve this problems?

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Have you used an "app password" when using Imap Gmail?
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Hi, thank you for your reply. Have you ever meet the same problem, and solved it finally? I can't find the way to generate the "app password"
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