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I played with the Notification settings for Calendar and changed the setting from Alerts to Banners. I changed it back to Alerts and I receive no alerts anymore (I was receiving them before playing with the setting.) The notifications show up in the Notification Center though but it's rather useless for me.
I did a test with the Reminders app (which has the same settings as above) and I got the same result: No alerts.
iMac 27″, macOS 10.13
Update
I did a SMC and PRAM/NVRAM reset on my iMac and the alerts came back. Please see the following article for instructions: https://www.makeuseof.com/tag/reset-macs-smc-pram/
Update
I did a SMC and PRAM/NVRAM reset on my iMac and the alerts came back. Please see the following article for instructions: https://www.makeuseof.com/tag/reset-macs-smc-pram/
No Longer Seeing Calendar Alerts in Big Sur
