Iphone Footage Tracking

Hi everyone!
I’ve been using PFTrack for several years and keep running into the same problem when tracking footage shot on an iPhone. I disable everything that could get in the way—stabilization, distortion correction, and other options. During the workflow I apply roto masks and the Enhance node to improve the footage, but PFTrack starts struggling right where it should perform best: it fails to lock onto high‑contrast points, and there isn’t even any motion blur. I just can’t figure out what’s wrong.
One more question about undistort: why does it activate only after tracking, at the solving stage? And how can I re‑apply the distortion once solving is finished?
Any help would be greatly appreciated. Footage with good quality you can find here:https://drive.google.com/file/d/1lswmeCL4LEl0u-dP1-byxrzGjd0vs_X1/view?usp=sharing

Thank youuuu🙏🏼