I had a similar problem where the firmware version between preferred and current were mismatched. In my case the carrier name was not missing but the versions were different and the current version was below the preferred. We did attempt a firmware upgrade on this machine and it has not been able to complete activation requests since then.
After completing the commands to set the impref to the correct carrier and resetting my EM7455 modem fired right up and activated like expected.
Thanks for the info!