About stopping the e-mail verification mail, I don't know what mechanism triggers them, unless you have https://docs.moodle.org/en/Email-based_self-registration activated. If not, I repeat what I wrote earlier:
>> You said: "now moodle asking email confirmation again for all of yours who they actually done email authentication earlier" What is "earlier", in the 3.2? in the 3.8 in Step A? Why did they do that at all? A user set for authentication method ActiveDirectory never have to do any confirmation via e-mail!
Authentication
Email authentication after server change
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