I'm having a problem where I can't pair my MX Keys and MX Master 3S to a single unifying receiver. They both pair perfectly fine to the dongles they came with but neither will pair to the same one. I've tried it through Logi Options and I've tried it through the Unifying Software and it won't work on either softwares or either dongles. Also the backlight on my MX Keys works for a few seconds after turning the keyboard on (the sensor picks my hands up) but after a minute or so if I go to use the keyboard the backlight doesn't work at all and the backlight keys have no effect.
All in all after spending £190 on a keyboard and mouse I'm fairly disappointed.
My email is rhitey@gmail.com if you have an ideas on what's wrong