Apple Watch

I hosted a meeting, and it ended due to a timeout. The participants' iPhones also timed out, but even though it should have ended, their Apple Watches were unable to disconnect the old session, leaving the meeting running. I started a new meeting, invited everyone, and when everyone finished, the new session disappeared, but the old session remained. I tried various methods suggested by a search, such as force-quitting, restarting, and uninstalling and reinstalling, but nothing worked. I'd like to end the session on my Apple Watch. Do you have any suggestions?