Hello Bing9723.
Thank you for using Apple Support Communities and for sharing these details with us. You mentioned that you're unable to use the Universal Clipboard feature since updating your macOS version. Universal Clipboard is a great feature to use. Allow us to assist in any way we can.
Are you able to use this feature between other devices? We want to confirm is this issue is only occurring when trying to use your Mac. If you confirm this issue is only occurring when trying to use Universal Clipboard with your Mac, we can suggest some basic troubleshooting steps you can try. First, try restarting your Mac to see if that helps:
Shut down or restart your Mac - Apple Support
Another step you can try is to test this under a new user account on your Mac. This is a great step to try and isolate if this unique issue is user specific. The resource below can show you how to create a new user:
Set up users, guests, and groups on Mac - Apple Support
Also, testing this in safe mode is another great troubleshooting step to try. For steps on how to start up in safe mode, check out this link below:
How to use safe mode on your Mac - Apple Support
Depending on your results, you'll want to follow the steps listed under "If the issue continues in safe mode" or "If the issue doesn't continue in safe mode".
We hope this information is useful. Cheers.