I have followed all the steps in this article Universal Control: Use a single keyboard and mouse between Mac and iPad - Apple Support but couldn't get it working (MacBook Pro running OS 12.3.1, iPad Pro running 15.4.1), including reset iPad, restart both devices etc.
How do I triage / debug?
This answer works for me! Thanks a bunch, bluecifer!
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From : bluecifer
Couldn't get Universal Control to work - HandOff already enabled
I had this same issue. My display wasn't even showing up in the Displays Properties. After some time troubleshooting as per Apple's instructions, I decided to "forget" the apple pencil bluetooth connection on my iPad. Everything works just fine now. A little bit of a pain but hopefully it's a kink that gets worked out when it's out of "Beta".
This answer works for me! Thanks a bunch, bluecifer!
------------------
From : bluecifer
Couldn't get Universal Control to work - HandOff already enabled
I had this same issue. My display wasn't even showing up in the Displays Properties. After some time troubleshooting as per Apple's instructions, I decided to "forget" the apple pencil bluetooth connection on my iPad. Everything works just fine now. A little bit of a pain but hopefully it's a kink that gets worked out when it's out of "Beta".
If you already tried (to no avail) ALL the steps provided in the support article that led you here, I suggest that you contact Apple Support directly, using this link:--> Get Support
Regards
Giulio
After removing all connected Bluetooth devices on my iPad, it works!
Couldn't get Universal Control to work - HandOff already enabled
