Discovered my solution this morning. This issue is a conflict on my Samsung Galaxy S22 Ultra between Norton Secure VPN and Google Calendar sync. Shows up as a "Sync Error" in Google Calendar. I have been trouble shooting this for a couple of weeks. Tried all suggested solutions. This morning when I turned off my Norton Secure VPN, Google Calendar sync'd. So I tested this theory several times and each time that I disable Norton Secure VPN the "Sync Error" didn't happen. So I turned Norton Secure VPN on but activated Split Tunneling in the settings of Norton Secure VPN and excluded Google Calendar and now my Google Calendar sync works.
Thanks for posting this. It can help others having an issue with an app.