No preview on iPhone

I have 3 Drift Ghost X cameras.

I get no video preview on my iPhone 7 but it works fine on my iPad Pro.

I've been working with Drift tech support off and on for more than a year with no resolution.

I've done everything they suggested and then some.

From firmware to resets to app deletes and reinstalls. I'm at my wit's end at this point.

I searched and found this is a problem that Drift knows about but has absolutely no idea how to fix.

Does anyone have any ideas?

I'm about to through the cameras away.