best response confirmed by ThereseSolimeno (Microsoft)
adam deltinger

‎Jul 17 2020 04:53 AM

‎Jul 17 2020 04:53 AM

Solution

Re: Cannot call Guest User

In the case they were logged in when you made the call? :)

Check here on the guest permissions:

https://docs.microsoft.com/en-us/microsoftteams/set-up-guests

Adam
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