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

I logged out of iCloud account (Apple ID) on both iPhone and MacBook, logged back into iCloud on MacBook first then did so on my iPhone. After logging back in on iPhone the MacBook then requested my Apple ID password again (notification in settings) to "finish setting up Apple services", also requested phone password. Once this was all done clipboard started working again.

I had problems using UC between two Macs where it randomly disconnected. My main Mac was connected to an external monitor to its right and to the right of the monitor was my other Mac.

I read an article saying that ideally the devices should be within 1 meter of each other. Mine were maybe 1,2 meters apart.

I tried moving the second Mac to the left side of the first Mac and Voila, everything works flawlessly.

Not saying this solves your problem but might be worth a try ...

Here is what I did to fix it.

[ I was using universal control between my M1 MacBook Pro and iPad Pro. After I close the screen of MacBook and open again, the universal control was gone. I used to log-out & login my iCloud account to fix it, but this time I'd like to find an easier way. ]

I open System Settings and click my Apple ID at the top left corner. On the bottom of the right pane is Device which lists the devices bounded to my Apple ID. I click the iPad Pro and it will show the information of that device. Nothing to do here, except maybe just clicking the back arrow, and the universal control comes back quietly.

Very simple. No need to log-out/log-in your iCloud account.

You may try if this works for you.

The logging out of iCloud trick seemed to work for me.

Read this solution! it worked for me Universal Control not Working. "add displ… - Apple Community

Turn "Allow handoff ....." on both devices On and Off. Helps every time the feature stops working.

Br,

Update: I'm now using Synergy.

Without signing into the apple id on devices, universal control simply does not work. This should be clearly mentioned in the official UC manual to avoid any hassle. Thanks

Followed the instructions in the reddit thread but no help.

Every time I click on the Universal Control.app to launch in Macintosh HD>System>Library>CoreServices to reset the firewall I get the following message alert:

"The application “Universal Control.app” is not open anymore."

and the console app spits out the following upon inspection:

13:45:52.538827-0400 uiagent com.apple.launchservices handle LS launch error: {\n AppPath = "/System/Library/CoreServices/UniversalControl.app";\n ErrorCode = "-600";\n}

13:45:52.563499-0400 agent com.apple.universalcontrol keyFocus: deactivated by losing front-most status

13:46:20.191381-0400 CLinkD com.apple.rapport E93FCAFC.skipped.nilClientCnx: UniversalControl:671, ControlCenter:543,

13:46:20.191451-0400 CLinkD com.apple.rapport E93FCAFC.skipped.missingFlag.trustCircle: UniversalControl:671, ControlCenter:543, knowledge-agent:495, ContinuityCaptureAgent:523, homed:528, cloudpaird:787, UniversalControl:671, biomesyncd:672, homed:528, assistantd:668, sharingd:551, assistantd:668, rapportd:504, sharingd:551, assistantd:668, assistantd:668, ControlCenter:543, ... -1 more not shown

13:46:20.191507-0400 CLinkD com.apple.rapport E93FCAFC.skipped.statusControlFlagMismatch: UniversalControl:671, ControlCenter:543, knowledge-agent:495, ContinuityCaptureAgent:523, homed:528, cloudpaird:787, UniversalControl:671, biomesyncd:672, homed:528, assistantd:668, sharingd:551, assistantd:668, rapportd:504, sharingd:551, assistantd:668, assistantd:668, ControlCenter:543, ... -1 more not shownidentityservicesd:525, ... -15 more not shown

I'm experiencing what @ForeverTangent is seeing. I just updated BOTH my i7 MBP and M1 Air to 13.3. There are no updates available for Xcode, the firewall is not enabled on the MBP (the UC 'primary') and enabled by policy on the Air, e.g. I cannot disable it. I'm seeing the following ERROR in the Console when I try to launch UC from Finder

Process: CoreServicesUIAgent
Message: handle LS launch error: {\n    AppPath = "/System/Library/CoreServices/UniversalControl.app";\n    ErrorCode = "-600";\n}

What happened to me since updating to Ventura and the latest version of UAD's console software is, Console works, but no longer opens it's window on startup. And I CANNOT shut down without Force Quitting Console. My iMac (essentially) stays "frozen open" until I force quit Console, and then it shuts down.

Agreed! This is incredibly frustrating. The logging out method worked a few months ago and again today. It's great that this works, but I would appreciate it if Apple prioritized fixing this issue. It's quite disruptive.

Didn't work for me unfortunately. Right now it works on my Mac Mini with my 12.9" iPad M1 but not my Macbook Pro M3 Max, I spent literally weeks with Apple support until they completely ghosted me, I'm really gobsmacked this is how a trillion $ company treats their customers.

Holy crap!! Tried rebooting multiple times before updating from Ventura to Sonoma (Was reluctant as I heard it slows down Macbook Air).. Then reboot multiple times again as the update did not fix the issue.

After reading this.. tried and it worked immediately..

[Edited by Moderator]

This just hit me as well. I've followed numerous postings on line and made sure all the settings are correct. First, a restart of both devices worked (as non-ideal as this is), but now, this also isn't working. There has been no software updates between things working and things not.