FISC/FISCR don't order surveillance, they permits it; the only compulsory powers they have are to limit the scope and conditions of the surveillance permitted, and that's binding on the government under FISA, which criminalizes certain surveillance unless authorized by FISC/FISCR.

And that's a pretty weak compulsion, since the people who are bound are the people who would ordinarily prosecute any federal crime, and they probably aren't interested in prosecuting themselves.

FISA courts issue warrants, which are court orders. All US courts have the power of the writ which means they can issue further orders to effectuate an order or ruling. So a court can order a company to assist the government in the execution of a warrant. This is pretty long-settled law.

The fact that some government agent applies for the warrant does not alter the fact that the warrant, once granted, is an order nor does it remove the power of the writ for further orders to effectuate the warrant.