Set up open federation to Teams

Teams external access configuration screen can be a bit confusing in case you don’t click the Learn more link to get more details.

If you add any domains to allowed list in this screen, you end up in a situation where a domain you haven’t added gets a notification:

So it is not a open federation. Looking at Learn more documentation you can find out why:

If you want open federation do following

  • Enable External Access
  • Enable Users can communicate with external Skype Users
  • Don’t add any domains to the list with Allow

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