"Hey, Google" issues

I'm having an issue on my wife's S26 Ultra and it's driving me insane; her "Hey Google" voice prompt won't work. I've ran through every setting on her phone related to the Google Assistant, even trying to set up Bixby to force the voice usage.

We set up her voice match twice, allowed microphone settings, and still nothing. She's currently at work but I can still putt around on my S26 - any tips I might be missing?

TL;DR - having issues setting up the Google Assistant's "Hey, Google" feature on an S26 Ultra