Azure AD connect

[Raul Ramirez]

My active directory domain is different than the domain I purchased from GoDaddy. For example, my Active Diretory domain is test.com and my domain from GoDaddy is test2.com. When configuring Azure AD it says "users will not be able to sign-in Azure AD using their on-premises credentials" because test.com is not verified. test.com is my local domain. How can I configure this so that I may integrate both domains?

[#2]

Add additional UPN suffix for your AD that matches the domain name you use in O365 and change the UPN for the users you want to sync to match it.

[#3]

Hi Raul

Has Vasil said you have to change UPN to all users the best way is by a script. 

You can see this example that could help you. https://blogs.technet.microsoft.com/canitpro/2015/07/07/step-by-step-changing-the-upn-suffix-for-an-...