I cannot make or receive calls from my Mac

Are you saying that your house has both a home wifi network and your office's wifi network?

Or are you using the Mac and Phone at both work and home?

This is the Mac Pro desktop forum so are you lugging the Mac Pro desktop to work?

Can you use FT and Messages on your home network?

Check that your Mac meets the minimum requirements: System requirements for Continuity on iPhone, iPad, iPod touch, and Mac - Apple Support

All that matters is the age of the Mac. You can check that by going to the  menu and choose About this Mac