Universal Clipboard/Handoff breaks

[Guest flang]

it was working between High Sierra MP3,1 & Big Sur MM8,1 .

11.6.5 on MM seemed to break it.

Signed in and out of Apple on both

Toggled WiFi & BT on both.

They are connected thru an unmanaged switch.

There is no checkbox for Handoff with High Sierra.

All I want is clipboard.

Ideas?

 

Source: MacRumors