imessage voice-to-text not working when car is turned on

New here, been driving my 2018 Prius 3 for 3-4 weeks now. All phone and audio functions were working fine until I updated my iphone X to ios 13.3 the other day. Now, when the car is turned on (even in park), I'm not able to do voice-to-text in imessage. When the car is off this function works fine. (Note, I'm not trying to dictate a text through the voice button on the steering wheel - when I tried that it took me through all the voice recognition training prompts and then said my phone is not compatible with that entune function.)

So let's say I get a text message while the car is on. I pick up the phone and to respond I click the little microphone icon on the imessage keyboard to dictate a text. Ordinarily there would be audio waves to indicate it's recording me, but instead there's a flat line and no text comes up in the field where it's supposed to.

I was on the phone with apple yesterday for an hour and they weren't able to figure it out - had me restart, delete and re-pair the phone on bluetooth, etc. They think the issue is with the car, and told me to find out if there's an entune update I need. I haven't called Toyota yet - not even sure who to call about this!

Has anyone dealt with anything like this before? It's as if it's a new toyota "safety feature" to prevent distracted driving that I didn't opt-in to. Not saying I'm going to text and drive now but how does it know I'm not a passenger? am i supposed to turn off the whole ignition just to send a text while in the car? it's ridiculous.

Who/where at Toyota should I call about this?