I have this issue with certain P10 PCMs serial numbers not being properly recognized. There is a way around it, uncheck the high speed mode when reading or flashing (affects both operations). Ive attached screen shots that show my V2 is licensed to tune the controller and where the s/n is correct with high speed unchecked and where the s/n is wrong with it checked. Read is the same way.
I verified this with 2 seperate PCMs yesterday, not sure if its related to a later build as I havent done much tuning lately and have upgraded a few times without flashing in between.
As you can see in the flash setup, the OS, filename, and VIN all match. What I just noticed is that the calibration DOES NOT match 12576872 (file) vs 12584593 (PCM info window) but then it is correct again.
Dont know whats up but if its affecting me its probably messing with other people too. If you need .blx files I will get them. One of the TBs does have aftermarket radios but my personal one does not, I checked both operations to verify on my stock TB.
Hope this helps with tracking down the problem!
EDIT: Running 7.5.6 (latest build) and 2.06.15 fw.