Teams: unable to invite people with same domain as guest


most of our servers including Exchange is on premise and most users use the on premise servers.

We have a few 365 E3 Users who which are in the test team and evaluating.

Since the the domain in O365 and on premise are the same lets say all of our users (including the o365) have an email like *** Email address is removed for privacy *** on premise and the 365 users have an 365 account which is the same *** Email address is removed for privacy *** because they just need it for login not for ExchangeOnline.

Teams works well for the 365 Users, BUT we cannot invite one of our on premise users as guest in the Teams App to a meeting.

Guest Access is activated and it is possible to invite guests from other domains, like or whatever but we cannot invite a user with domain which is not created or present in O365.

*** Email address is removed for privacy *** (can login and work with teams and invite other 365 users or external users)

*** Email address is removed for privacy *** (is not an o365 and cannot be invited because it says "we didnt find any match")

Is there a setting in the admins panel, that allows users from the same domain which are not present in o365 to be invited?

I read this topic a few times but never got to a solution.

Regards Sascha


Hi Sascha KFA,

The on-premise email address cannot be invited as a guest. Teams support anyone with a business account (that is, an Azure Active Directory account) or consumer email account (with, or others) can participate as a guest in Teams. Here is the reference: Who is a guest?

Therefore, if you need to let your on-prem users use Teams, you need to deploy AAD Connect to sync those on-prem users to Office 365 and then assign the online licenses to them. Users who are in the same organization cannot be added as guest, they can only be added as a member. For more detailed information about how Teams and Exchange on-prem integrate, you can refer to the following article:

How Exchange and Microsoft Teams interact

Please feel free to let me know if this information helps. If you need any further assistance, welcome to post back.

Best Regards,


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Question Info

Last updated January 11, 2021 Views 1,179 Applies to: