Hello whiteliondd6
I was facing your issue and I think have this might help you.
The MCU config tool read the files in de folder "board" and the pop-up Error shows the no coincidence with the board.
I found this is an error for peripherals.c, please open this and change the MKE15Z256xxx7 to MKE16Z256xxx7 like the image show and make a compile and try to open again the "Config pin".

Regards
Pavel_Hernandez