iFTX, Lightning iPhone, FT-891, and DR-891

As the title says, I have an iPhone 13 Pro Max (Lightning), and an FT-891 rig hooked up to the DR-891.

I want to know if anyone has had success with this specific combination (not necessarily the phone model, but an iPhone with Lightning) getting FT8 on iFTX to work properly and through the cable, not just using the phones speaker and mic.

I can’t seem to get this setup to work and would love to use it, but obviously need some help. And I dunno if it makes a difference or not, but I have one of the pre-release DR-891’s. I’m thinking not but who knows.

Do you get any error messages when plugging in Digirig into your iPhone via the OTG adapter?

I don’t have an OTG adapter. Not sure what that is tbh. Someone told me on a different forum I need an adapter instead of a cable? They’re not the same thing?