With these computers it is 110% chance that you will receive a faulty floppy drive unless it has been repaired sometime earlier. Floppy drives on PS/2 systems started to fail already in the early 90s, the common problem are SMD caps, but some of the drives have other issues too. Recapping the drive may or may not solve the issue, but it is worth a shot. I managed to get one failed drive working after replacing the caps, but as I said, some drive models have other faults too or leaked electrolytic has already ruined the PCB and components. You can find several threads about repairs of these drives, as well as YT videos.

There are some more reliable variants, I have one later Sony 2.88MB drive which just works, but different PS/2s use different types of drives with different connectors, some media sensing, some not etc. When getting a working replacement, you need to check the FRU numbers that IBM themselves announced compatible with the particular model of PS/2. Wrong type of drive may even fry the floppy controller on MB, so do not just get some random PS/2 drive as a replacement. Ardent tool is your friend with all the necessary PS/2 infformation.

There are adapters which allow the use of regular drives. Texelec sells at least one type of adapter. One thing to note with adapters and standard floppy drives is that it may be impossible or at the minumum bit of a hassle to align standard floppy drive with the PS/2 face plate and eject button hole. But you absolutely need a working floppy with these computers, otherwise the system won't even boot when the CMOS battery dies as you need to use the setup disk.

In general, these systems are very challenging to work with because they are full of proprietary crap. Models below 50 are usually the easiest, because they at least have ISA and like my 35SX, a standard IDE, but there are always some IBM bullcrap which makes replacing components a hassle.