Hi there

Do you know if users from different domains (UPN – User Principal Name) under the same Office 365 tenant can talk to each other using MS Teams?

Short answer: YES

  1. Go to your DNS preferred provider and buy 02 different domains
  2. Go to your Office 365 Tenant and add those 02 different domains
  3. Enable 02 different users, one on each domain (@domainA.com , @domainB.com)
  4. Log on 02 different browsers or Teams client and Browser and try to reach user@domainA.com from user@domainB.com and vice-versa

Check interaction in action

TIPs!

  1. users can be Azure AD synced (synced from your on-premises ADDS – Active Directory Domain Services)
  2. users on on-premises ADDS needs to be nested on different OUs (if you manage different UPN / domains / companies) at the same Active Directory domain.
  3. users need to have different UPN (User Principal Name), email address and ProxySMTPAddress attributes proper configured to be synced over to Azure AD / Office 365.

Please check the article I posted on how to Add an additional domain at Office 365

Please check the article I posted on how to Create a new user with different domain / UPN (UserPrincipalName) on Office 365

thanks,

Thiago Beier
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