This is a Windows file system that rose to prominence in the 1990s before NTFS took its place in Windows systems of the early 2000s.
The reason removable media like flash drives, memory cards, etc.
If joining a domain, go to System in Control Panel to change the computer name and try again.
If joining a workgroup choose another workgroup name.
All is running fine except for one thing that has to do with the Apple ID login stuff.