If the problem persists, it may be interference from another FM channel.
Refer to the "Find an FM Frequency" section in your Sirius XM radio's user guide. Activation Fee: For each Receiver on your account, we may charge you a fee to activate, reactivate, upgrade or modify your Service.
Make sure the Sirius XM antenna cable is not bent or broken.
Turn your Sirius XM radio off, then on, to reset this message.
But if this will possibly fix it, thanks for the info. Hopefully now, activating it will cure the UPDATING issue. I had attempted repeatedly to activate my radio through calling them and it was always stuck on "updating".