IMEI is not in Xfinity's database for Samsung Galaxy Watch 7 44mm LTE

I recently switched to Xfinity and bought a Galaxy Watch 7 44mm LTE for my wife as an anniversary gift. However, we soon ran into a problem: we are unable to activate the device's LTE function because the system states that the IMEI is not in Xfinity's database. I would like to request that the device's IMEI be added to Xfinity's database so we can use this feature; it is a recent model, and I paid a premium for this capability—meaning our inability to use it stems from a registration issue regarding the IMEI number, not from device incompatibility.

Thank you in advance.