Autopilot support for multiple Domains on a single tenant

[Chris Yue]

My office 365 tenant includes multiple domains to include the following:

mycompany1.com
mycompany2.com

mycompany3.com

I have also setup Windows Autopilot (AAD Join) for my tenant.

However only email addresses from mycompany1.com are recognised accepted when enrolling Windows 10 devices.

How do I add the other domains to the accepted list of email domains for Autopilot?

[#2]

Hi,

You could check out this link... as normally you would login with the upn and not with an additional emailadress..

Why not changing the upn for that user/s who want to start using autopilot?

but maybe enabling it would work ? (not sure as I didn't tested it myself)
https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-authentication-use-emai...

[#3]

@Rudy_Ooms_MVP thanks for the response.

The UPN does match the email address already but I think with the article, I could possibly use another one of the email aliases.

So in other words, user@company2.com is the non working UPN domain, but I guess I could test and see if user@<tenant-name>.onmicrosoft.com might work also as a possible workaround.

[#4]

It's worth a try i guess :) please let us know the outcome