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"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 ...
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.
