There were no changes recently done. The keyboard had been working just fine in BIOS in the past. But I did what was suggested and tried a different USB port first before turning on the PC and it resulted in the same problem; then I switched USB port while in the BIO and I managed to get it working. Weirdly enough, when I got back to Windows, I had to unplug and replug (in the same USB port) my keyboard for it to be responsive.
All that to say, thank you for your help and sorry if did not update this any earlier, I wasn't home to test it.
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