teams chat issue with Skype for business - Hybrid mode

Question

Hi, we are testing our migration from Skype for Business on premise server 2015 to Teams.

Specifically, I'm testing co-existence of the chat function - which should work

Hybrid has been configured as per https://learn.microsoft.com/en-us/skypeforbusiness/hybrid/configure-federation-with-skype-for-business-online

Teams has external access enabled for all domains. Global coexistence mode is SFB only

Edge config and Hosting provider below

Our test has testuser01 migrated to teams, and testuser02 still on premise SfB

testuser02 can chat to external (3rd party) teams users - but cannot chat to testuser01.

testuser01 can see presence for testuser02, but can't chat to testuser02

likewise tetuser02 can't chat with testuser01

I have concerns regarding the hosting provide setup - as the documentation still sets the autodiscover URL to webdir.online.lync.com - however this host no longer exists

Answer 1

Hi @David Frith

We checked your command result and the Autodiscover URL is no issue.

So please check if you make the corresponding change in your Teams organization to enabled shared SIP address space with your on-premises deployment.

To enable shared SIP address space in your organization, establish a remote PowerShell session with Teams, and then run the following cmdlet:

Set-CsTenantFederationConfiguration -SharedSipAddressSpace $true

Besides, we found that a user's coexistence mode impact's what functionality is available in the user's Teams client. This means that the value of mode can take precedence over the value of other policy settings, depending on the mode. For more details, you could refer to:

https://learn.microsoft.com/en-us/microsoftteams/teams-client-experience-and-conformance-to-coexistence-modes#impact-of-mode-on-other-policy-settings

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