Sent items from Outlook App (iOS) not syncing with IMAP mail server

Resetting the account did not work for me. I had to go through all the emails I had sent from my phone and then forward them to myself to create a copy of them. Then delete the account and set it up again. Sure enough all those sent messages that did not sync disappeared. But it did fix the problem. Now I have issues with receiving multiple notifications on my phone for the same emails I receive, even when the email has already been deleted. I give up.

I have the exactly the same problem!

is there a solution????

Yes, the help desk told me to reset the offending account. It worked and so simple! Go to outlook settings, press the name of the account and near the bottom of the page is an option to reset it. I cannot comprehend why no one has said this before.

I have the exactly the same problem!

is there a solution????

I'm having the same exact issue with my Apple iCloud email account via IMAP., when working with IOS Outlook My work Exchange server does not have this issue, which is interesting.

As I don't want to lose extensive Sent history, I'm going to wait and see if this bug is addressed by Microsoft.

I had to speak with a representative myself.  They got me hooked up to my Outlook desktop app, but still no 'sent' folder in the outlook phone app, even deleting IMAP account and re-adding it a couple of times.  This is frustrating.  Also, the Outlook server is slow from my desktop app.  Other email platforms quicker to update and push email through.  You would think Microsoft would have this one figured out and maintained.