The Mag interference sounds bogus. And it won't link between the controller and the phone. Have you tried connecting the controller to the DJI Assistant 2 program on your PC? You might be able to diagnose something that way or try a factory reset. Then of course you need to relink it to the Mavic.
"MAG INTERF""Magnetic Field Interference. Fly with caution"I get this whenever the Mavic is turned on while the arms are folded in, but twice today I also go
The DJI Fly app interface was designed to be simplified and ultra-intuitive. Compatible for DJI Mini 4 Pro, DJI Air 3, DJI Mavic 3 Pro, DJI Mini 2 SE, DJI Mini 3, DJI Mavic 3 Classic, DJI Avata, DJI Mini 3 Pro, DJI Mavic 3, DJI Mini SE, DJI Air 2S, DJI FPV, DJI Mini 2, Mavic Air 2, Mavic Mini.
.
dji mavic pro 2 mag interf check app