Has anyone been having trouble lately with the Windows Calendar App not syncing with Google?

I use Mail/Calendar/People synced up to my Gmail account and have had no problem with it for ages. The last few days, Mail started showing a message that my IMAP settings are preventing it from syncing with my Gmail. I checked everything - IMAP enabled for All mail, trash, inbox, etc... and seems all good. Plus Gmail works fine with the e-mail app on my Samsung Galaxy S9+ so I don't think it's on Google's end.

I ended up deleting and re-adding my Gmail account and then the e-mail is syncing great again, no problems. But now, I can't see any of my Google Calendars in the Calendar App. It shows my Gmail account under the accounts section. Calendar is toggled ON to sync but nothing shows up at all - I just see the Reminders calendar (I use Microsoft To Do app) and nothing else. The Google calendars show up and sync fine on my phone again (Samsung Calendar App) but nothing on my Windows 10 machine.

I've tried repeatedly deleting and re-adding my Google account. I've tried resetting the Mail/Calendar app in Windows 10. I've removed and reinstalled Mail and Calendar, still nothing. Cleaned temp files, etc.. Disabled Anti-virus (ESET Internet Security). I made the upgrade to 1909 and still no luck.

I'm at a loss why it would just stop working like this. Any thoughts/advice? Thanks in advance! :)