Universal Control No Longer Working Between Macs after update to Ventura 13.3

Did everything. Firewalls, toggling Bluetooth on and off, wifi, shutting down each system, firewalls, turning on and off handoff/airdrop etc nothing worked.

In the end, I signed out of iCloud on the machines, tuned off the computers and back on, then signed back in, turned on and off, then finally it worked.

Apple ID Solution appears to Work (Log out > Log in).

After updating to Ventura 13.4, UC stopped working completely between an M1 Ultra Studio, M1 Max MacBook Pro & 2017 iMac Intel i7. Everything was perfect before.

After the update to 13.4, UC ceased to function for Apple (M) Chip devices. M Chips could then only connect to the iPad Pro, not to each other or the iMac. The iMac, however, COULD connect to each M Chip devices and the iPad Pro (ha!)..but then, it stopped too.

After several back-and-forth conversations with Apple Support, they could not correct the issue. I almost gave up until I discovered this thread. Attempting all the solutions here, the one that worked for me was simply Logging Out of Apple ID and Logging Back in. ...for good measure, I rebooted each device (iMac took longer), and they all started 'talking' to each other again.

Viola!

I had the same exact issue with my macbook air and my iMac. My iMac would connect to my iPad but not my Macbook, I wanted to do UC with all 3. After reading this thread and trying almost everything, the only one that worked was signing out of apple id on my iMac and Macbook & restarting both, sign back into both (signed into my Macbook first) and after a few moments UC started working together with all 3. Thank you to the person who suggested signing out of apple id. Apple has to fix this issue.

I'm in the same boat and it finally came down to the same issue with my firewall as written by this reddit user: https://www.reddit.com/r/MacOS/comments/124v25i/comment/je6bngz/?utm_source=share&utm_medium=web2x&context=3

I had to re-enable the firewall on my Intel macBook, reboot it, toggle my WiFi/Bluetooth and Universal Control settings, then Universal Control popped back up in the firewall settings with incoming connections allowed, and started working again. Good luck!

I logged out from my iCloud accounts and then logged them in again and it start working again

This worked for me too - Thanks BeyondBay!

Logging in and out of iCloud didn't work. I could see my other mac in the Displays [+] dropdown, but couldn't push through to its display.

Once went to my AppleID settings and clicked on the Mac under the Devices list, I could then push through to its display.

@APPLE please fix!!!

Logging out of both devices, restarting both devices, and then logging back into both devices worked for me. THANK YOU SO MUCH! This has been bothering me for months--maybe even close to a year!

I opened a case with Apple to have this looked at. While discussing with an engineer, we weren't able to correct this. However, he suggested I create a new login on EACH computer, log in with these IDs and connect them to my AppleID. I did this and nothing changed. UC was enabled by default but not working. After a few minutes, I logged back in with my "regular" accounts.

After a few minutes of being logged back in, UC started working again! I suspect that there's something going on with UC and our AppleIDs but I can't say that with any certainty.

Best of luck to you all and I hope this fixes the problem for you.

Check: "Displays have separate spaces" This option must be ON to use universal control.

MacOs 13: (go and check) System Setting--> Desktop & Doc -->under Mission control: Displays have separate spaces(ON).

This worked for me! Thanks for relieving what had been a few hours of frustration. I did find that it was necessary to shut down the iPad and the Mac and start them back up again (I think I started the iPad first, but am not sure it would make any difference). Something to keep in mind for others: If you have several devices (Macs, iPads, iPhones) when signing back in to your Apple ID, you will be asked to provide your device credentials for each device you would like to sync. For example, I have an older MBP which is on the same Apple ID. I needed to enter the ID for my current MBP and the older one (as well as for iPhone, iPad, etc).

Now let's see how long it continues to work.

Try signing out (and in again) from Facetime on your Mac.

That fixed it for me, never had any issues ever again.

Logged out of iCloud on iPad and iMac and then back in and then rebooted both, seems to be working now. Thanks for the tips. Only thing is now all the items I had saved on my desktop appear to be gone. Any suggestions?

Howdy everyone. Thank you all for the great input.

I hope this might help someone with the same frustration I was in: after reading all the solutions, I decided NOT to sign out of iCloud, and just RESTARTED iMac with Ventura (won´t update the OS further, mid 2017) to have Universal Control back (stopped working for no reason) from a Macbook Sonoma, which did NOT work.

After SHUTTING DOWN the iMac, UC started working again. Now, the Macbook sits in front of the iMac and the keyboard switching hassle is gone.

Best to all,

Log out and login worked for me

I tried everything here, nothing worked.

Then I updated Xcode, restarted my computer, and Universal Control just started magically working.