Real-time traffic on infotainment maps missing - '24 Escalade

Hi - I have a 2024 Escalade ESV V with traditional nav (not Google Built-In) that had real-time traffic capabilities when I purchased the vehicle new - December 2024.  It would show color-coded traffic flows on the maps and reroute when navigating if there was a road closure or crash.  That functionality ceased to function somewhere around the 6 month mark - certainly by October 2025.  I have been trying to get the service back ever since.  I think I have every OnStar subscription possible including those that profess to provide navigation and traffic.

Does anyone know the service/source of traffic data on a '24 Escalade? Who is the provider?  This is not a Google Built-In vehicle.  HERE confirmed they provide the maps (SD card) but not real-time data.  OnStar has flip flopped between suggesting I should be able to install an app - Maps+ (manufactured by MapBox) and mistakenly sharing Google Built-In reboot procedures.  Maps+ is not rendered in my infotainment - I have used it in a 2026 loaner.  The vehicle has been to the dealer twice for this issue, multiple OnStar cases and now a Cadillac Customer Care case.  There is a lack of clarity around the source of the data and why it is not rendering on my vehicle.  The dealer today told me I did not have a radio that supports traffic, only available in the highest trim levels.  I have the highest trim available that year with the AKG Studio Reference infotainment system.

FYI - the infotainment firmware is dated June 2023. Searching for OTA updates produces nothing.  It occurred to me that the traffic was supplied by SiriusXM in the 360L trial - they have a nav and travel subscription which supplies traffic data.  SiriusXM said my vehicle does not support their traffic service.  This is driving me crazy.  I need a technical expert.  Thanks!