I’m running Big Sur. My wife and I share some calendars.
today, she has events showing in a calendar she shares with me. It’s not showing up on my Mac Calendar app nor my iPhone Calendar app.
Last week I had an event of my own in a shared calendar. It was visible on my Mac, but not my iPhone.
I tried turning the calendars off and on on devices. no effect. I suppose I could log in and out of iCloud accounts.
Anybody else seeing stuff like this? Any suggestions?