Windows 10: Unable to sign in to Outlook.com on one account (server not found)

Rep given, this was it!

To benefit possible future readers who might find this thread, here's the scenario and solution:

Scenario:

• You have a domain which is added to Office 365 tenant (an existing Office 365 for Business or Enterprise subscription)
• In the O365 tenant you have created an email address using your domain, for instance john.doe@mydomain.com
• You have created a Microsoft account selecting the option to use an existing third party email as a Microsoft account email
• At this point you have your "real" email john.doe@mydomain.com and a Microsoft account with the same email address
• You will check the "real" address' mail by adding this domain email account to any email app, or using Outlook Web Access at https://outlook.office.com/owa/?realm=mydomain.com
• With this same email but now as a Microsoft account you sign in to all and every Microsoft services and apps, including using it as sign in account in Windows 8 or later
• In Microsoft account's settings you have set up normal outlook.com alias, for instance L: john.doe-email.alias@outlook.com
• To get mail for this alias, trying to sign in to outlook.com or add the Microsoft account to any email client fails, you can't check emails for the alias address

Solution:

• Sign in to https://account.microsoft.com with your Microsoft account john.doe@mydomain.com
• Change your primary alias (at the moment still L: john.doe@mydomain.com) to any of your aliases with a Microsoft domain (Hotmail, Outlook, MSN or Live)
• See this tutorial if you need help in changing primary alias: Microsoft Account Aliases - Change Primary Alias - Windows 10 Forums

That's it *Smile

You will receive a confirmation on your "real" O365 email:




Some Windows apps and services might sign out asking you to sign in again, in my case now Skype was the only one, but as your original Microsoft account name john.doe@mydomain.com remains intact (it's just not the primary alias anymore), everything continues to work. If you had signed in to Windows with L: john.doe@mydomain.com, you will sign in with that also in the future.

Simple solution, I am a bit ashamed admitting I wasn't even close, had never thought of this.

I mark this thread solved, was able to get my mail messages for the Microsoft account alias.

 

Ah I'd just found a Microsoft page with what looks like the same solution:
https://support.office.com/en-gb/art...1-e1fa44b03ff5

 

That's great Kari! I'm happy that worked for you.