"We can't setup the conversation because your organizations are not setup to talk to each other"

I get this message when I try to Teams chat with another tenant. Do both tenants have to be in "Teams Only" mode at the org level for this to work? Tenant A is in Islands Mode with external access ...

microsoft teams

Joe McGowan
Feb 09, 2021
ChristianBergstrom

Looks like I found the issue. When I did a Get-CsTenantFederationConfiguration, the AllowedDomains setting was blank. I added "AllowAllKnownDomains" and chat is working now.

https://www.thirdtier.net/2020/04/10/microsoft-teams-does-not-allow-remote-users-to-connect/

I think this setting was inherited from our Skype for Business configuration which had federation disabled, but that is a guess. Our tenant is still in Islands mode, target is Teams only, and I'm able to chat with them now.

Joe McGowan

Iron Contributor

Feb 09, 2021

ChristianBergstrom

Looks like I found the issue. When I did a Get-CsTenantFederationConfiguration, the AllowedDomains setting was blank. I added "AllowAllKnownDomains" and chat is working now.

https://www.thirdtier.net/2020/04/10/microsoft-teams-does-not-allow-remote-users-to-connect/

I think this setting was inherited from our Skype for Business configuration which had federation disabled, but that is a guess. Our tenant is still in Islands mode, target is Teams only, and I'm able to chat with them now.

ChristianBergstrom

Silver Contributor

Feb 10, 2021

Joe McGowan Hello, short of time yesterday. Glad it got sorted and thanks for the update!

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"We can't setup the conversation because your organizations are not setup to talk to each other"