Since ios 16.4 my iphone does not allow text messages played on infotainment system in car

I hav a iphone xsMax. Does not work in Buick Encore. Since the update of 16.4 I can not receive any text messages on the infotainment system in the car. Everything worked perfectly before update. I spoke to apple and no one could come up with a solution. At times the calls do not come through either. I can not make a call when I am driving ( all my phone settings are correct). I have done a reset on my phone, reset the network settings, made sure all settings are correct, disconected from bluetooth, deleted all bluethooth connections and started a new bluetooth connection. Phone works perfectly when not connected to a car. I tried using my old iPhone and it connectedly perfectly. All messages and calls came through. This phone has iOS 15.

I need a solution FAST!

Did anyone ever find out if this was resolved? I'm having the same issue in my Buick Encore but I only acquired the vehicle in early August of 2023 so this feature has never worked. It alerts me to a call only when the call is missed. It flashes on the dash screen for a second and stops my music but at that point the call has been missed. My watch doesn't alert me to a call either. My phone works when the vehicle is not on. It does this if I'm in park or driving.

I spoke with tech support this morning but they didn't have any suggestions other than updating my software. I spoke to 2 different reps. The first one said she wanted to try and call me back to see what happens after doing nothing but checking to see if I had a focus on. I of course missed the call and had to call tech support and speak to a different rep. He was the one who advised to update the software on my iPhone but I have updated my software at least once after I purchased the vehicle and it still didn't work. This is extremely annoying to have people call and I play phone tag with them.

>_<

I’ve tried everything. Just a no. When I plug it in with the cord to head pandora it will at least give me a notification

Exact same thing with me!! When is this going to get fixed like Apple messed it up with that 16.4 update

Yes they did and they messed my stuff up!!!!