Can't use WhatsApp

So this is probably an app issue but good luck getting it through them. I got erroneously banned for a moment with WhatsApp. It got lifted as an error but after I couldn't register. It keeps saying that I'm using an unofficial version. Based on the loop I'm getting with their email it looks like the app thinks this is an unofficial or custom rom. Anyone know what's going on there?

Using OnePlus 9 on Android 16 beta 3.2