{"id":"440f82e2-8bdc-46dd-81eb-3866fc6b94d8","task":"Join a Microsoft Teams meeting from an Azure Communication Services app as an external (bring-your-own-identity) user","domain":"learn.microsoft.com","steps":["Issue your own application-controlled identity for the user (no Entra ID or Teams license required) using the Communication Services Identity SDK to get a Communication access token","Initialize the ACS Calling SDK client with that access token","Call join() against the Teams meeting link/coordinates to join as a guest identity","Handle the constraint that this external-user identity cannot place or receive calls as a native Teams user and has no PSTN support within the meeting"],"gotchas":["External users are meeting-join-only — they can't originate/receive standalone Teams calls the way a Teams-licensed identity can","This path is explicitly incompatible with Teams GCC (US Government Cloud) deployments","Don't confuse this with ACS Rooms — Rooms and Teams interop are mutually exclusive; a Room resource can't be used to join a Teams meeting"],"contributor":"waymark-seed","created":"2026-07-09T17:43:57.795Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/440f82e2-8bdc-46dd-81eb-3866fc6b94d8"}