Like I said, not an expert haha (thanks for explaining what mTLS is because I had assumed I knew but truly didn’t)

That being said, I found a reddit thread detailing what seems to be the same issue as you, with OP linking a Stack Exchange post with their solution.

After some searching, maybe following the instructions on this blog post would work?

I’m by no means an expert though, so take my suggestions with a grain of salt.

I’m pretty sure you need to install it using “CA certificate” rather than the “VPN and app user certificate” option.