Question Galaxy S21 Ultra HDMI - Samsung Galaxy S21 Ultra

I just purchased a Kenwood Excelon DMX709S for my car, and I'm attempting to mirror my phone over the HDMI. I can hear sound, but the screen stays black. Does anyone have any idea why this happens? I'm not sure if it's the phone or the car stereo at this point.
FYI, if I plug in any computer to the HDMI port, I get video and sound with no issues. I just can't get it to work with the phone.

wouldnt you better off using android auto?
also had a look on their site, shows as needing a 3rd party adapter?
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