I had an issue where the volume down and volume up keys on my Logitech MX Keys keyboard were both increasing the volume on macOS.

I came across the below steps to reset it, which fixed the issue.

1. Turn the keyboard off and then back on.
2. Press the following key combinations: Esc + O, then Esc + O then Esc + B
3. The device switching lights will blink rapidly.
4. Turn the keyboard off and on again.

Device Switch 1 will now blink rapidly, which means it’s ready to be paired again.