Calendar Error: Your event couldn’t be refreshed. The calendar was not found on the server

I think I found the solution! Here it is:

1) I was using my macbook Apple Mail to view multiple accounts including the Gmail account that my calendar invite issue was occuring. I rarely log on to a browser and use my Gmail.

2) I found the original calendar invite in my Gmail email using a browser (Chrome). This is what I found there at the top of the email which contained the calendar invite:

3) When I selected "I know the sender" and then added the calendar invite, it added to BOTH my Apple Calendar and my Google Calendar (which is synced with my Apple Calendar). No more triangle with the error message: "Your event couldn't be refreshed".

So far, I have been able to do this for three distinct, separate event senders with no issues. Apple Mail does not alert you that the Google calendar is not accepting the "unknown sender" which means that this is in fact a Google calendar issue since it is the source of flagging unknown senders which results in the Apple calendar error message because Apple calendar cannot pull the event information from Google calendar since it was never added even though it was added to the Apple calendar.

Let me know if this fix works for you!!!

I had the same issue. Google added a security feature that prevents users from being spammed with calendar invitations. A fix is to go to the settings in the Google Calendar web interface, and under “Event Settings” change “Add invitations to my calendar” to “From Everyone”. That will open the door to calendar invitation spamming but will prevent the security feature from fouling the Calendar.app sync process after accepting an invitation from an email in mail.app.

Hello jaggu_nothing,

As we understand it, you're seeing that error message related to a Google calendar account on your Mac, and you've already tried removing and re-adding the account, and it only occurs on this specific Mac. Is that right? We'd like to get a few details and see if we can assist.

To clarify, does this only happen with the Google account on the Mac in question? Knowing that will help in narrowing things down.

Overall, since this only happens on one Mac computer, your best step will be to boot into safe mode to test. This runs a basic disk check and prevents some items from launching on startup, so it's a good way to narrow things down. Here's How to use safe mode on your Mac:

"Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again."

Once you start up in safe mode, test it out. Then click Apple menu () > Restart to get back to normal mode. Let us know the results, or check out the link posted above for next steps based on those results.

Kind regards.

Hi jaggu_nothing,

If this issue only happens with the Google calendar for your organization, your best bet is going to be to reach out to the system administrator for further assistance.

Take care.

This is 100% a mac-OS system issue, not Google. This is a new problem for me in the last week and occurred in perfect alignment with my update to Ventura OS 13.5.2 (22G91). Of interest, I also have another backup macbook (same model) but NOT updated to OS Ventura. The calendar invite of interest adds to my SAME Gmail Google calendar for the backup macbook with no issues -- only sync issue (triangle error in pic) is with the primary macbook which is on Ventura. Unfortunately, most tech support agents, as you see here, are not really interested in the "why" but have learned to make you jump through hoops (log out, refresh, blah blah blah even when already troed) only to tell you that it is not within their department or not an Apple problem and to call Google support or someone else). They are more interested in getting you off of the phone/thread and to another person than actually trying to troubleshoot and find the source of the problem. Its bad diagnostic work to say the least.

Same thing is happening to me. Very frustrating because I missed a meeting. The weird thing is that I do have some meetings that did show up on my phone calendar. It's so inconsistent as to which meetings are synced to my phone and which ones won't. So far it seems Microsoft Teams Meeting invites are showing up. But this one meeting sent to me via Next Gen Crn, which uses Zoom won't show up on my phone (it was accepted on iCal app). I just deleted some meetings on iCal, and it synced to my phone. But the triangle is still there, and this one zoom meeting I'm trying to sync won't appear on my phone.

edit: I just turned off iCal, and turned it back on and it synced all meetings with my phone. BUT the triangle is still there for my gmail account.

Hi jaggu_nothing,

If the issue is isolated to one Gmail account, and not all accounts, you will want to continue to work with Google to get the issue resolved.

Take care.

I have the exact same issue. The synchronisation stopped working a few days ago. I have been removing the google account and after putting it back it does sync and get events from my google account. However, when I add a new invitation in my Mac, it tells me that "Your event couldn’t be refreshed. The calendar was not found on the server"

This makes the calendar useless to me, unfortunately.

Similar story here, my calendar app, Mac OS Ventura, was working fine accessing my company's Google Calendar, until just a few days ago. No configuration changes on this laptop between when it worked, and today. Google Calendar sync on my iPhone and iPad is working fine.

Also ... at least in my case, new events are still showing up in my calendar. Perhaps the alert itself is the problem, at least that's how it seems to me. It's alerting that there is a problem, when there's not a problem.

I'm on MacOS 13.4.1 (c) now. I'm curious if that's the same version where others are having problems.

Pushing us to Google tech support, for what seems like an OS-specific issue on the Mac, seems like the wrong direction if the goal is "resolving the customer issue".

Same issue here. Only have the issue when adding cal events from email into Apple Cal app on a Google business email. Triangle appears, event doesn't sync. No issue with personal gmail. Tried all the reboot, remove, re-add, etc didn't solve anything.