Hi there,
I'll ask this as succinctly as possible; I can provide more detail if needed. Our main DC is on Server 2012 if that is of any consequence to this topic.
Our AD domain is "company.local". Our public domain (and our O365 email domain) is "companyinc.com". As such our local users are "company\username" and our email identities are "username@companyinc.com".
My internal domain is not routable, so I can't use Azure AD Connect without making some changes.
It seems like I can add a UPN suffix named "companyinc.com" and configure each user to use the domain including the suffix. I've researched and it seems that there will be no user-facing consequences. We use no SSO or federated services.
I have not been able to find answers for the following:
- Will my internal domain now look like "company.companyinc.com"? Will usernames inclusive of the domain change from "company\username" to "company.companyinc\username?" I feel dumb asking this: what happens to the .local?
- Will there be any consequences with email? e.g. will O365 want to authenticate user@company.companyinc.com?
Thanks for reading and for any advice you may have.