"Not recognized" as in trying to open it returns "No Disc"?
"No disc" means the drive did not find a recognized format on the disc. This response comes from the drive and operating, and is beyond the control of MakeMKV.
If the operating system recognizes the disk and MakeMKV says there are errors while reading it, that is different.
It must come from the blu-ray film then because my player tries to recognize the disc but does not succeed. And MakeMKV too.
I will send it back if I can, thanks anyway.