Mac Calendar "Server responded with an error" message

This exactly. It is not our machines or really even a bug. There is some change/switch/cache - something that occurs at about 3:30 to 4:00 pm PST (same time worldwide) that just does not match to what was working. It could be an expired token that kicks in at that time or something... but then 8 hours (a standard workshift) it changes once again and everything is working. My money is that its at the Google server point. Is there a Google support ticket open? I wouldn't even say its 'Apple Calendar' just your calendar app. Doing any of the steps, cache dumping, add/remove - none of that actually works - you're just hitting the time window and getting a refresh when its working. It comes back.

Yes, agreed!

I am running Catalina 10.15.7 on my beloved early 2015 MacBook Pro (Retina, 13-inch), and I am having this issue, too.

It feels relatively new - I've had my gmail calendars connected to the Calendar app for over a year. I once got it to go away by deleting the whole Gmail account & restring it, but the problem came back.

At this point I can't trust Apple Calendar. I am moving to Chrome to view my google calendars. Apple Calendar worked after I rebuilt -- and that action removed the time zone information in my appointments. But now as you all say, it isn't working again. I have been adding events in different time zones to my google calendar using the different time zone support feature.

One thing I've noticed is that Google has support for the start and end time of the events being in different time zones, while Apple Calendar has support for the whole event being in a different time zone. I wonder whether support for different time zone for events is clashing somewhere between Google and Apple.

Also I hope everyone here has filed a Apple Support ticket. I have, and interestingly have heard NOTHING back from them. NOTHING.

This is a problem on Google servers. 3:00 pm PST to midnight PST Monday to Friday - PST their servers start to throw a server error. Apple needs to get the attention of Google with this and just dedicate some time to log in, show the error and Google can configure to not throw the error. If any of the people with support tickets can pass along links so we can add onto them, that might help... or means of opening a new ticket and reference that same issue - it raises the awareness to support

I have this problem too. It happens for several hours, every few days.

Apple will tell you to reset NVRAM, safe mode, etc. none of which should be necessary if they'd just make technology that works!

Of course, these remedies do nothing.

I've tried setting my reset rate to every 15 minutes instead of 5. One possibility is that Google is refusing the connection due to too many attempts (by me or everyone?)

I pretty much can't trust that the native calendar and mail apps will accurately reflect the state of my gmail account. I've resigned myself to using Outlook (!) as my main mail and calendar app on my Macbook.

Nice job, Apple.

I am still seeing this issue across at least there different macs with three different processors and OS versions, and none of the "fixes" really fix it for long, including the cache removal. What is interesting is that I have now noticed it seems to happen at certain times of day. Yesterday I noticed it at night from about 9pm till I went to bed at 12m. Today when I got up, the calendar was working perfectly with Google syncing correctly and zero errors. This was on all there machines and it worked fine all day today, until about 8pm, when I noticed that all machines were showing the grey error triangle on the Google calendar again. I will continue checking and noting times, but I wonder if there is some server process that is run each day at Google that is interfering with the server responding?

The troubleshooting link does not help with this.

Has anyone been able to resolve this?

Please know that although many are stating it is a Big Sur issue, the sync problem is not exclusive to Big Sur. I and some others using High Sierra have the same problem.

Thanks @Daniel Feldman for confirming this is a Google server side issue, so I can stop wasting time trying trying Mac level fixes.

I take it back. The problem returned after two days. :sob:

I'm going to try to delete all my old events in my google calendars and see if that fixes it.

Classic Apple. Clearly an issue, but they fail to acknowledge it until it's resolved...

I have this happening across my iMac (Retina 5K, 27-inch, 2020) v. Big Sur 11.2.1 (20D74) & MacBook Pro (13-inch, M1, 2020) v. Big Sur 11.1

Interestingly, my old iMac from 2011 running Catalina seems OK - and is communicating with the Google Server fine....

Sort it out Apple. This is a disaster for work. I don't want to mess around deleting caches etc.

Same issue. I have 6 Google accounts connected so going down the @daviddrahos path sounds arduous. It would seem something has gone sideways between Apple and Google needing fixing. Please advise ASAP please. Thanks!

It seems that way... Quite shocking that they haven't picked this up day 1 of it starting. It's actually been a problem for around a week now at least...

Can't imagine gmail --> Calendar on Mac is a rare set up for people around the world, so would assume there are thousands of people with this problem...🙄

Sort it out apple!

I've been having the same problem. Started on Thursday and it has been on and off, but always malfunctioning around 6 p.m. PST. Tried clearing the caches and all and still no fix. Hopefully they sort it out