When you reformat a floppy disk, it doesn't matter what was originally on the disk or if or how the floppy was formatted beofre: During formatting, everything that was on the floppy is overwritten.
So if you cannot format the disk, no matter under which OS, then either the floppy disk itself is bad, or your drive is bad. That's assuming you really format it, and don't just try to write new data or a new filesystem onto it.
It doesn't matter that you can see the disk in file explorer: Reading from a bad floppy disk may still work, at least for some sectors/tracks, while writing these or, more likely, other sectors/tracks may not work.