I have a Macbook retina with Mojave 14.14.3 and iPhone X with the latest iOS installed.
Continuity and handoff are working.
As soon as I switch to my partner user account on the Mac, which is linked to her iCloud account and her iPhone 6s, handoff and continuity stop working, on both accounts.
Apple Watch unlock also stops working. Only a reboot can get it back to normal operation, as long as I log into one account only.
I tried EVERYTHING:
Delete account and create it again.
Log in and out of iCloud on all devices.
Reinstall macOS (no initialise, just reinstall).
Reboot all devices obviously.
Delete bluetooth preferences.
Update to 14.14.4 beta 3.
Pram reset after disabling csrutil.
SMC reset.
Initialised the Mac and performed clean install.
Reset network settings on my iPhone and my partner’s iPhone.
Nothing can fix the issue.
I sent a bug report to apple several times and they don't care. Too busy adding emoticons to the next release.
It is all working, as soon as I fast switch to the second account everything falls apart until the next reboot.
iCloud clipboard, instant hotspot, continuity camera, handoff, Apple Watch unlock, nothing works.
Any clue? I use continuity camera a lot to scan documents and iCloud copy and paste, it drives me crazy, I'm rebooting 10 times a day.
Thanks everyone!