Logitech k580 keyboard

This KB has a feature where you can connect to 2 devices. the keys are f11 and f12. Very cool....hit f11...type on laptop (I have mine docked so don't use the laptop KB) hit f12 and I can type on my phone so as to annoy people with super log text messages.

First one I bought I could have SWORN that the key to the right of the space bar (ctrl/opt - this KB works with Macs as well) worked as the right click of a mouse. The context menu. I added my phone to the KB (f12) and the key stopped working.
spoke with Logi support. Installed Logi options. No help....does not work. In fact the key does nothing as far as I can tell.
Chatted with support again and they said to return it as it is obviously broken.
Received new KB (typing on it now) and the key does nothing.
Does anyone have any experience with this? It's pretty annoying as I use this key ALL the time.

winver is latest...win11home. everything is updated. Not doing anything funky expect running 2 monitors off a dock.
Connected to the laptop with the logitech unfiyer. there are 2 devices connected through it (mouse / kb) the unifyer itself is plugged into the laptop, NOT the dock.
Thanks!