The Federal Communications Commission sided with T-Mobile US Inc. in a dispute raised by satellite-radio operator Sirius XM Holdings Inc. over interference issues in its radios.

Sirius had attempted to block a relatively small exchange of licenses between T-Mobile and Verizon Communications Inc,, claiming that some T-Mobile cell sites disrupt its satellite signals. Sirius said that providing more licenses to T-Mobile would exacerbate the problem. T-Mobile says it isn’t doing anything wrong and blames Sirius radios for the...