Are you using a on your motherboard, or are you using a USB adapter ?

download drivers from generic “driver update” sites claiming to have “PS/2 keyboard driver for Windows 10/11.” They often provide:

USB-to-PS/2 Adapters: If you are using a passive green/purple adapter, ensure your keyboard is electronically compatible with both signals. If not, you may need an active converter. Conclusion

(for PS/2 port functionality)