Can't add 2 or more IMAP accounts with same incoming server
I'm trying to add 2 IMAP accounts that use the same mail server.
e.g. user@mydomain.com and info@mydomain.com (both using mail server mail.mydomain.com).
If I add the 'user' account first it works and the second won't connect when adding. If I add 'info' first, the 'user' account fails. I know the login details, port etc. are all right, I can add all mails on android without any issue.
I've tried using different email apps too, but doesn't seem to work.
Is there anything I can do to fix this?
(iPhone 12 pro IOS 14..)
iPhone 12 Pro, iOS 14