Mac Calendar "Server responded with an error" message

The same thing happens to me.

No dice here and we're into March. Repeated calendar failures, in Catalina. It looks like I'm going to have to pretty much migrate my personal office stuff to Google.

This worked for me--thanks. Hope Apple can fix this in their next update.

This seemed to work for me, at least in the short term.

Thanks

I have the same pattern happen to me. Tried resetting everything in Cal settings but it keeps happening in the evening. It works during the day but gives me the error at night.

I have the same problem. Bumping to elevate it. My team is in a google environment. Need this to work.

First I got rid of the Mail app on my mac. Then I got rid of it on my iPhone (thanks to the fact that you can now choose another app as default for handling mail).

Next up — calendar.

It's truly ridiculous how poorly Apple handles issue like this.

I should mention that I am on a Mac Pro 7,1(2019) Catalina 10.15.7.

In addition to the three Google accounts on Apple Calendar, the same Google accounts on BusyCalc are also showing error.

I hope something is going on at Google to resolve this issue...

Talking to Apple text support said they found this on google about the 403 error (I got a 403 error once after new Apple OS install)

https://support.google.com/calendar/thread/98473879?hl=en

Now both (Apple Calendar and BusyCal) show no error.

Let's see what happens.

It’s back to the old pattern starts working at 5pm japan time

David - thank you for taking the time to post this fix. It worked perfectly.