Can your command team deny your terminal leave and force you to sell/waste all your leave days?

Commanders are the ones who approve leave. I'm curious because you said Command Team instead of the CO.

Terminal Leave is still ultimately a leave request and isn't a given. You still have to walk the paperwork. I would recommend just speaking to your leadership and figure out where the point of friction is. Sometimes it can be fixed with a 5 minute conversation.

You could use the search function and find that same question asked about a dozen times.

Yes. Yes they can.

Commanders approve leave, so, yes, you can be denied leave. Normally, the Commander will need a good reason from your supervisor to deny terminal leave. You can talk to your supervisor, First Sergeant, and Commander (in that order) about a denial.