While that says something; but not enough to understand why
your Apple devices no longer use various aspects of Continuity.
Here's an overview and specific links to parts of Continuity.
Perhaps some of your products OS are seriously outdated?
• Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support
https://support.apple.com/en-us/HT204681
• Instant Hotspot
• Handoff
• Universal Clipboard
• iPhone Cellular Calls
• Text Message Forwarding
• Auto Unlock
• Continuity Camera
• Continuity Sketch
• Continuity Markup
• Sidecar
• AirDrop
• Apple Pay
Each of Continuity's sections has an ability; most these work OK
between my iPhone SE (iOS 13.4.1 ~ & Mac Mini Late 2012, i7 Q.C.
2.3GHz (server) w/ Mac 10.11.6, 10.9.5, & 10.13.6; in two hard drives.
So you may have to check and re-check settings; restart your mac
and your phone, to see if you can sync their software; handoff, etc.
Helps should you choose to identify systems in your Apple products.
Good luck & happy trails!🌻🌤