Exchange calendar not syncing in macOS Monterey 12.3

I’m having the same issue. A reboot fixes it for awhile but if I sleep my MacBook for an extended period of time the issue re-emerges and needs another reboot.

one other comment, my iOS devices aren’t having this issue and calendar sync is working there. It’s just the macOS device.

Hi,

I'm dealing with the same issue. I've found that you can do the following to resolve the issue for little while:

launchctl stop com.apple.CalendarAgent
launchctl start com.apple.CalendarAgent

I'd love to know if anyone has a permanent fix.

Thanks,

Jonathan

Thanks for this. 12.3.1 has the same issue. I just added the below to my crontab to run every hour.

0 * * * *       launchctl stop com.apple.CalendarAgent && launchctl start com.apple.CalendarAgent

Who knows when Apple will fix it. 🤣🤣🤣

thauxley wrote:

Every since upgrading to macOS Monterey 12.3, I'm having trouble with syncing my Exchange calendar in the native Calendar app. Note: by Exchange calendar, I mean the Office 365 calendar, a service my university subscribes to.

I am able to add the calendar to the native application and events do show up. But it seems that soon after that, it stops syncing and new events will not show even with a forced refresh.

Any ideas what to do? Is this is bug?

If your iCloud Contacts, Calendars, or Reminders won't sync

Microsoft Support

https://support.microsoft.com/en-us/microsoft-365

Started failing to sync again. I'm now on Monterey v 12.5.1. I may need to resort to running Outlook on my Mac for calendar. Come on Apple!!!

Well, if you aren't comfortable using the Terminal application then you might want to hold off trying. This is a command line application on your Mac and putting in the wrong lines of code could cause problems in your operating system (even though you'd need to know what those wrong lines are.)

The easiest fix would be to restart the Mac when you notice the exchange calendar isn't syncing, a restart will get the calendar agent running again.

Are you running the newest version of Mac OS 12.6? The Mac I'm having the issue on is updating right now and sounds like what was broken has been fixed in 12.6.

BUT if you want to try this Terminal fix to turn the calendar sync off, and then turn it back on again, its pretty simple.

The Terminal app lives in your Utilities application folder: /System/Applications/Utilities/Terminal.app

Below is attached an image I found online of what the application looks like after it opens. The blurred text will a combination of your computer name and your user name. After the $ is a gray cursor spot.

Once you have the application open, come back to the page and copy (CMD C) this line of code:

launchctl stop com.apple.CalendarAgent

Go back to Terminal and hit CMD V (Paste) and then hit enter.

You'll see that original first line of your computer and user name $ and gray cursor again. That will be the only acknowledgment that it was done correctly. If you get a message/error than the code line was not copy or pasted correctly. What this has done was shut down the running service in the background that is responsible for syncing new items when they come in, deleated or updated.

Come back to this page and copy this second line of code:

launchctl start com.apple.CalendarAgent

Go back to Terminal and paste this line of code in and hit enter. Again it will just show the cursor line to acknowledge that the code was accepted. If you know there was a calendar item that wasn't showing up on your Mac (say you can see it on your iPhone) then after these two steps above you should see that the calendar has updated.

Congrats, you did your first command line fix!

I also have this problem, and it's probably because Office365/Azure indicates my time zone as +1 (CET) instead of +2 (CEST). In my case, manually adjusting the time zone in Office365 was the solution. I adjusted the time zone to something that corresponded to my situation (in my case, I adjusted the time zone from Amsterdam (+1) to Athens (+2).

After deactivating/activating the account including a restart of macOS 12.3.1, everything works properly again!

Had this issue syncing both my Office calendar and iOS calendars. iCloud was working, and sync'd properly to my iOS device, but no events were syncing to/from my mac. This tip worked immediately and events started syncing again for both Office and iCloud. thanks!

Hi,

I am having the same issues.

Just noticed that NotStephenJob had the same idea: simply put jcrossett (thank you) commands in a cron job to run hourly 😊

So a permanent fix would be very helpful.

Thank you

Philip

Let's hope that Apple can fix this in a slightly more elegant way in the next update. This is becoming a real nuisance - I'd be hard pressed to move to Outlook for calendaring but I'm getting closer 😪

Same issue for me. Extremely frustrating, and a bit embarrassing - remember there was an issue with exchange calendars when MacOS 12.0 came out too!

The calendaragent fix doesn't work for me either :(

This is just a lower-tech version of Jonathan's solution, but I find that unchecking Mail for the account in Internet Accounts, waiting for the events to disappear from Calendar, and then checking it again causes it to start syncing again...temporarily.

The only thing that resolves it for me is deleting the calendar cache files, and forcing it to rebuild from scratch. And even then, it only fixes for a few hours. Likewise, this is not an issue on my other Mac on 12.1, or my two iOS devices - only the Mac on MacOS 12.3.1.

I actually can't get the CalendarAgent process to terminate regardless of what I do - via terminal or a force quit in activity monitor. So it seems to have a crash-inducing bug that is critically bad.

Definitely a very frustrating bug. Made even worse that this came on with whatever changes were made for 12.3, and also how common exchange-based calendars are.

Adding a comment just to track this thread. If someone sees this gets fixed in an MacOS update, please add a reply. Its odd that I get Calendar invites show up as coming in, but after accepting they don't become visible on the calendar without a restart, or doing the Terminal commands listed here. Thanks for that workaround!