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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.
Yes, confirmed visually that they have external access turned on with no allowed or blocked domains.
What about: ”If you and another user both turn on external access and allow one another's domains, this will work”. Doesn’t work either?