Hi there. Thank you for reaching out and we're sorry for the trouble. Can you please confirm what specific version of the DJI Assistant 2 for Mavic are you currently using? You may send us screenshots showing the error message so we can further isolate the issue. Please keep us posted. Thank you.
Several years ago the problem was too high of a video resolution. Lowering resolution allowed calibration to complete. Haven’t heard of this issue recently and thought DJI had fixed.