Can I safely remove admin privilege?

I have 2 user with admin privilege.

One is which was created by MIAB, and other is which I added later.

Can I safely remove admin privilege from which was created by MIAB?

Will it cause any issue?

Well, when I come upon this sort of thing, I test for myself something like this:

Create a third admin account you don’t plan to use for anything.

Make sure the account works by logging in, using admin (maybe add an alias or something), sending/receiving mail, etc.

Remove the admin privilege of the account.

Make sure the admin setting is removed but mail and everything is still working.

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Yes, you should be able to remove that original admin account with no issues.