Then the only explanation is that “Less secure apps” are not enabled on your Gmail account. I tested with my personal gmail account and it works as long as “Less secure apps” are enabled and password is entered correctly, otherwise I get the same error you get.
It’s working now. But I didn’t do any other thing in Gmail as I had already done them. I just downloaded the latest version today and that was all. Thanks @lubos
Yes sure “Less secure apps” should always be enabled theny Gmail will allow user / all to access Gmail vis other apps as in this case they secure permission from the Gmail user to validate this change and requirement of using third party apps.
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Best Wishes & Regards,
BM