handoff not working

There may be a need to check into more than one instruction in Continuity

support page, starting with the 'hand-off' and then check or re-set others

because they can effect others if not set correctly.

• Use Handoff to continue a task on your other devices - Apple Support

https://support.apple.com/en-us/HT209455

• Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

https://support.apple.com/en-us/HT204681

Depending on the choice, one may be able to follow the function across other devices;

some features may not be as universal to Continuity as others; also details are important.

Set up and follow-through carefully.