Script to prevent Microsoft Teams from making itself default for calls

Greetings Automators,

I am hoping that someone smarter than me can help me solve a problem. I have to use Microsoft Teams for work, and one of the worst things it does is it will reset the default application for calls within the FaceTime preferences back to Teams every time I open it. There are no settings in Teams to prevent this, which means every time I try to make a call with my phone it will try to go via Teams.

My question - is there a way to change the “default for calls” setting in FaceTime back to the FaceTime application via apple script? Something I could run at regular intervals or everytime I open Teams to prevent this. Many thanks in advance for any ideas!