Serious Problem Pairing and Activating CableCard to TiVo Bolt

I moved from Washington DC (FIOS TV service) to New Hampshire (Xfinity TV service) at the end of January.  I have been a TiVo user for over 20 years and had never experienced service problems until now.  Just in case we ordered two installation points, one with the standard Xfinity set-top box and one being a Motorola CableCard.  I have been trying to get the CableCard service to work now for over 4 weeks.  I am in my third CableCard and have been visited by technical staff twice, with the last technical staff having had the problem escalated to national level: Tier 4 Ticket No. [Edited: Personal Information], but still no solution.  Any recommendation would be mostly appreciated.  Here are the sysmptoms:

- On the TiVo side it appears that the pairing was not completed.  In any case, trying to access any channel (SD or HD) results on a V52 error message "Searching for a signal on this channel".  Other than that the TiVo box is fine and I can access old recordings made before we moved with no problems.

- On the Xfinity side it appears that the activation was completed.  At Xfinity website https://cablecardactivation.xsp.comcast.net/cablecardslist the cable card is listed with the correct serial number and the statement that it is "Currently paired to Host Id:[Edited: Personal Information]" which is the correct Host Id for the TiVo Bolt.  But proceding further to the next website page that asks whether the image and sound for the low channels are working as expected and given a response of NO, I am asked to call for technical assistance, that is tantamount to going back to square zero.

I want to register that the last technical staff, Brett, who came to our home continues to try to enlist assistance.  His persistance is greatly appreciated.