MBR2GPT Disk layout validation failed

Aaron BLook at your "logs". That will tell you where the disk needs space. Refer to the previous page with all the instructions, where many people found the instructions worked perfectly for their situation too.

The responses from MBR2GPT don't provide the information you need to remedy the drive / space. The initial response from running the command only provides information in the "log" that will help. Review the log that corresponds with the time and dated you ran the last test.
The log will provide specific information about "why" the test failed, and it's usually because there is not enough space either in the beginning of the disk or at the end of the disk. Either way, the "volume" needs to be reduced. Once you do the "Shrink", you will need to run the MBR2GPT test again.

If the test tells you the drive still does not pass, look at the log again and see "why".
The point is this. It's the "log" that provides enough detail for you to know how to resolve the issue. Then refer to the previous page where I detailed the instructions of how to make the drive compliant and you should be good to go.