I've been having a lot of issues lately with the scheduling. It said I completed a session the day before it was scheduled and I couldn't join the video link. One of my mentees said she couldn't reschedule a session, so she had to cancel it and schedule a new one.
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I've been having this issue too. It's syncing the calendar to the wrong days and duplicating sessions to have a ton of repeat sessions on my Google calendar. Maybe something got weird after AWS went down the other day?