See Chats and Teams while creating a meeting
Currently when I'm creating a meeting (in progress) I can't access chats and teams. It's not convenient, because I often want to copy paste some details from chats to meeting description. Currently I have to close the meeting and discard all changes to see any chat and get details from it or just discuss with someone meeting details or schedule.
Tomasz Bielenin commented
Same here. Want to check some details on your team related to the meeting and you have to discard meeting and start over once you found the information.