iPhone 15 Pro does not ring when my husband calls from his number (the other number on our account)

I have already put in a ticket with Verizon (escalated to their Network Engineering team) but thought I would see if anyone has suggestions here, as well. My phone rings for everyone except my husband's phone number. I have checked all the blocked numbers, alert settings, etc. I deleted his contact completely to make sure it wasn't a ring tone that wasn't working, and then I recreated it from scratch, too. The phone is not muted (his work number rings immediately when trying to call along with all the other numbers that we've had try calling). I also deleted every number I've ever blocked from the blocked calls/texts just in case something was stuck in there. I receive text messages from him both on and off iMessage (SMS texts come through as do iMessage texts). The phone acts like he's blocked when he calls, though - does not ring and I don't get a missed call notification, but if he leaves a voicemail, it notifies me and then I can listen to that.

I went to the Verizon store and they issued a new ESIM just in case that was a problem, and they did not know what else to try, either.

The iPhone 13 Pro I had on 9/22 worked - I activated the new phone and transferred my data and the iPhone 15 Pro has never rung for his number again.

I honestly don't know that this is a hardware problem, but I figured I'd ask here in case someone somewhere has seen this and fixed it.