TeamsMeetingDialog

Two entry forms — a work-meeting link, or a meeting ID plus an optional passcode. Validation and server refusals render inline, under the active field; the info line names the viewer as an external participant.

Proposal, for sign-off: bringing the room into a Teams meeting

Epic #7168. The pre-join card offers what Teams sees as your camera: you at your seat (the default) or your view of the room. In the meeting the room replaces the gallery, and what Teams receives stays in the corner, changeable at any time.