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Brass Contributor

Jun 19, 2020

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Interaction Teams2Teams and Teams2Skype - Issues and Question / UPN vs. Email

Hello, i have an understanding issues regarding the Teams2Teams interaction and also with Teams2Skype. Consider the following scenario. Tenant A: cloud only account / Teams only UPN ...

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RealTime_M365
Jun 30, 2020
Hi ErikVet

The is by design. Majorly because the Teams Application uses the UPN ID which indeed would also be the SIP Address for the Tenant B Users where the Tenant A Users are trying to reach to. Hence Tenant B need to fix the Email and the UPN Addresses to make this work.

With Regards,
Satish U

RealTime_M365

MVP

Jun 30, 2020

Hi ErikVet

The is by design. Majorly because the Teams Application uses the UPN ID which indeed would also be the SIP Address for the Tenant B Users where the Tenant A Users are trying to reach to. Hence Tenant B need to fix the Email and the UPN Addresses to make this work.

With Regards,

Satish U

dvillarejo

Copper Contributor

Jan 31, 2024

In many cases it is not the solution to have the same UPN and email, for example a multinational with numerous brands and systems with SSO based on authentication domain, it is very complicated to make UPN changes or have multiple domains given the impact it can have on security applications. third parties, systems with SSO, etc.

Using SIP:email in the proxyaddress should work to solve this.

RealTime_M365