Presentation settings for scheduled meetings automatically changed to "Only Me" when "Everyone" had been set previously.
I had scheduled a week's worth of meetings occurring M-F for a virtual training. On Wednesday afternoon, my instructors stopped being able to present unless they were marked as Presenters. The meeting settings showed that "Everyone" could present, but marking instructors as Presenters fixed the issue.
Upon reviewing the meeting settings again this morning, all the meeting settings had been changed to "Only Me" can present. This occurred for all scheduled meetings, including those in which the issue had not occurred earlier in the week. I have manually adjusted all of my scheduled meetings to change the setting back to "Everyone" can present, and I am waiting to see if that resolves the issue.
I hope there wasn't a change to the default permissions—this is not something I want to change for every meeting I schedule.