Incoming Facetime calls blocked on Sequoia 15.0.1
 

When DisplayLink is running calls to my iPhone no longer also appear on my MacAir.
Turning off DisplayLink restores that feature, so the problem is definitely associated with DL.
I recall I had the same problem when I first upgraded to Sequoia 15.0.0 and some setting fixed the problem, but it has reappeared with the upgrade to 15.0.1/

You have to 'Allow Notifications' with the option, 'When mirroring or sharing the display' enabled, as described here --> https://support.displaylink.com/know...ction-in#notif