I am not able to assign participants who have dialed in to a meeting via Microsoft Audio conferencing to a room. It appears the users must have used computer audio as there join option. Microsoft has often said , for the best user experience to use Microsoft audio. Will dialed in members be allowed to assigned to breakout session in the future?
@Christian Zenzano Thanks for this question. Supporting participants who dialed in to be assigned to Breakout Rooms is currently being considered in our development backlog. Please refer to our Roadmap to get the latest updates on planned features Microsoft 365 Roadmap | Microsoft 365