Outlook: Can't re-add outlook.com account w/ custom domain

Question

Hi,
I have new information on that old topic.

To summarize: I cannot re-add an outlook.com account with a custom domain (e.g. me@myself.com (instead of something like me.myself@harsh.com .com)) in Outlook 365. This worked for years like a charm.

What I recently discovered: if I add a new outlook.com alias (like mynewalias@harsh.com .com) to the same account and set it as primary address, I am able to add it to Outlook.
But: I'd like to use my custom domain alias.

I am able to do the same in Outlook 2016 without any problems. Even Windows 10 Mails and Outlook on Android work as expected and I can re-add the account with the custom domain at any time.

Obviously, something in Outlook 365 is broken.

Can you please assist?

Thank you,
Patrick

Answer 1

Problem. I think I stumbled across a variation of this issue. After noticing that my Microsoft 365 subscription offered a personalized email with a godaddy domain, I decided to try it. After creating the personalized email (eg. me@mydomain.com) I tried to set it up on Outlook (desktop) but was met initially with a failure to sync, subsequently by a complete failure of Outlook to launch and a cascade of error messages beginning with "Outlook cannot log on. Verify you are connected to the network and are using the proper server and mailbox name. The Microsoft Exchange service in your profile is missing required information. Modify your profile to ensure that you are using the correct Microsoft Exchange information service." The personalized email worked fine with Outlook.com and Outlook for Android.

Troubleshooting. After trawling online and these fora, I tried the following:

1. Create new profile - unsuccessful
2. Repair profiles and data files - unsuccessful
3. Deleting profiles and creating a new one- unsuccessful
4. Running the Microsoft Support and Recovery Assistant (SaRA) - unsuccessful
5. Reinstalling Office (via the M365 interface) - unsuccessful
6. (On advice of a Microsoft support agent) update (ie. reinstall) Windows 10 - unsuccessful, and now have the joy of occasionally stumbling across new and unrelated glitches!

Solution. Eventually, the following has (so far) worked for me:

1. Delete my profile
2. Start Outlook (desktop) and create a new profile
3. Enter my personalized email address but check the box to manually set it up
4. Select Outlook.com
   5 Set incoming server to IMAP / imap-mail.outlook.com / port: 993 / encryption: SSL/TLS (from dropdown)
5. Set outgoing server to SMTP / smtp-mail.outlook.com / port: 587 / encryption: Auto (from dropdown)
6. Leave the SPA box unchecked

So far, so good... I'll update if things change.