Exchange account disappears in Mail after install of Mojave

I think I may have found a solution online that actually worked.

1. Login to https://outlook.office.com/mail/inbox
2. Click on your initials at the top right corner of the screen and click on my account
3. Click on manage security and privacy
4. Click on Additional security verification
5. Click on Create and manage app passwords
6. Create a new app specific password for Apple and copy the password
7. Then create a new exchange account and click on configure manually and enter that password in.

This seemed to work for me and everything is now stable.

Thanks! This eventually worked - I kept having the problem until I uninstalled the problematic exchange account from all my linked devices (phone, ipad, laptop). After that, I removed the "exchange" keys from keychain. Then, I reinstalled the exchange account on all the devices. No problems since.

I had this problem too on Mojave and finally managed to fix it. Like others the Exchange account would mysteriously auto-delete after a few minutes of being created. This only happened when iCloud Keychain syncing was ON AND Contacts syncing with Exchange was on.

I tried lots and lots and lots of things - all the above - and others like trashing half my Library folder! Tore my hair out. This is what finally seemed to work:

0) turned Keychain syncing off on the Mac in question

1) deleted/reset my login keychain and all files in Library/Keychain 

2) deleted everything I could in my System Keychain (except for airport passwords). 

3) deleted every 'certificate' I could in my System Keychain on all my Macs.

I think it might have been the last thing that did it, but when I turned keychain syncing back on, the problem went away,

My conclusion was I had some sort of poisonous certificate in my keychain.

Phew!

This was happening to me as well on Mojave 10.14.3. Simply not syncing contacts on the offending Exchange account fixed this problem for me. Thanks to those that did the work to figure this out!!

yes, the 10.14.4 update completely fixed my issues with exchange account disappearing.

Thanks for the reply. Tried everything from the linked website and still vanishing into thin air. Only thing that has worked is unchecking Keychain in Icloud and that is such a crappy work around. So frustrating.......

I have been told by my employer IT department that "Apple has indicated that this should be fixed in Mojave version 10.14.4.

Since this is currently only in Beta we have not been able to test it yet. 

Apple has not set a release date for that update at this time, but it looks to be soon"

With that being said, guesses on when 10.14.4 will move from beta to production? Or better yet, does anyone currently have the beta downloaded and use an exchange account with no issue?

I've been having this issue for weeks, I just unticked contacts as you suggested but also calendar as well and so far its the longest Exchange has stayed up!!! Fingers crossed this works, Thanks!

I've been able to solve this problem using the workaround of disabling Keychain, but I'm wondering if there are any updates on better solutions since that solution was posted in November 2018?

Just letting you know that the fix from the website link I posted on January 19th solved the issue for me - and it's been stable for 4 days now. I feel your pain, though. I was also dreading having to use Outlook for work. Maybe poke around a little more on that linked website for other options? Good luck.

There is a workaround that has worked for me until they actually fix the issue. Go into your iCloud account and uncheck Keychain. Not sure what the link is between Keychain and this issue but turning it off has allowed my Exchange account to stay active.

So far, this is the only solution. Waiting for updates!!

Okay that seems to have worked .... it has been 15 mins and it is still there .... has any more permanent work around turned up yet?

It’s been 3 weeks now and the solution works great.

there is no option for me for Additional security verification.