I sent a message to Dodge Customer Care, they directed me to SiriusXM Guardian to solve my update problem.
Their representative determined that my phone app stopped updating the day I started my paid subscription after the free trial ended. Apparently there's a setting somewhere that I need to change to opt in for phone app updates. The last VHR email I received was on 5/19, the MOPAR VHR was updated 5/20. Dodge phone app last updated 2/23/24.
The rep couldn't tell me where that setting is, and I can't find it on the MOPAR site, SiriusXM site, or Dodge phone app.
This is the FAQ on the SiriusXM site that seems to address this issue, but I can't find a "Vehicle Preferences" choice anywhere.