Reinstalling macOS via the recovery tool didn’t change anything. Maybe something new with Catalina? I think I’ll try fusing the 2 SSDs and give it another try
I’m on Catalina. MacOS is installed in the 2TB SATA SSD. I just formated the 128Gb PCIe SSD with MBR and FAT and Boot Camp Assistant still throws an internal error has occurred after launching. I will try reinstalling macOS via the recovery tool like you suggested and see if it fixes anything
@jayman16 I successfully completed your guide a couple of weeks ago and I’m super happy with the results. Thank you! I read that you have installed windows on the 128Gb PCIe using bootcamp. I just tried launching bootcamp and immediately get an error. After some searching it seems to be related to the fact that there are 2 internal drives and boot camp doesn’t work. How on earth did you manage to install windows?