iPad Mini 6 did not work for me with P4PV1. After about 8 months of dealings with DJI, they finally replaced it with P4P V2.0. I test flew it this morning and the P4P V2.0 works flawlessly with the iPad Mini 6.
I don't know if it is too late to answer this thread, but I use as Anker cable and have no problem getting my iPad mini 6 interfacing it Tony Phantom 4 Pro. Here is a link to the cable https://a.co/d/9xoO3Q5