Comment by hanche
3 years ago
Bluetooth is used to discover peers and to initiate communication. Thus handoff works even on a wifi network that blocks broadcasts. It even works when no wifi network is present, by setting up an ad hoc network for the connection. (Disclaimer: This is all I know. The details seem rather murky, as handoff is a proprietary Apple protocol.)
The requirements are here: https://support.apple.com/en-au/HT209455
Turning off Bluetooth or wifi may be one of the more common reasons it doesn’t work. Some people never do that, but others do.