Hi dharcbus,
Welcome to the Apple Community.
You might want to check Screen Time settings ( ie: settings may limit what you are able to do.)
Apple support have articles online (links below) that may help troubleshoot.
Sign into or out of FaceTime on Mac – Apple Support
Change preferences in FaceTime on Mac – Apple Support
Use FaceTime on Mac - Apple Support
Make calls in FaceTime on Mac – Apple Support
Set up your iPhone and FaceTime on Mac for phone calls – Apple Support
Eg: Says: If you turn on Wi-Fi Calling on your iPhone,
you might be asked to turn on Calls from iPhone on your Mac when you open FaceTime on your Mac.
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And:
If FaceTime isn't working on your Mac - Apple Support
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More info:
FaceTime User Guide:
(NB: Click "Table of Contents" at top of Welcome Page ...
For accuracy: Choose your MacOS at top of articles.)
FaceTime User Guide for Mac – Apple Support
If needed:
The Official Apple “FaceTime” Support website:
(NB: There is a "Get Support" link (and an app) at the bottom of their webpage).
FaceTime - Official Apple Support
Hope this helps :-)
