In all iOS 13 devices from the company are facing the same issue with this update, emails are not arriving, data connection is failing, sent items are twice displayed. Please fix the issue, if you need info i can deliver, only happens with the Email app and exchange and outlook servers.
iPhone XR
i'm asking to the exchange team but, this also happens with and ordinary outlook mailbox setup into the mail app, if you send an email you can see it double in the sent emails part. Also there are many discussions about it.
https://discussions.apple.com/thread/250742919
No such problems in my company.
What version of Exchange are you running on the back end, including what service pack.
iOS 13 email issues
