I can't select maximize conversion as goal. Running ads for mobile app

It says "You can maximize value of conversions after you set up and select a Pixel" which makes no sense since I'm running ads for a mobile app (iOS). I use Tenjin as MMP. I can run maximize app event or install fine, but can't select conversion for some reason. The old reason was my account wasn't verified/too new.

Does anyone know a fix to this?

Maximize value of conversions for app campaigns requires a Facebook Pixel connected, which doesn't apply to mobile app campaigns running through an MMP. Stick with maximize app events and optimize for your purchase event, that's functionally the same thing for app traffic.