When I first got my MX Master 3 mouse, I spent more than an hour trying to get it to connect to the Logitech Dongle. It would connect and was useable with basic functionality but "Logitech Options" wouldn't recognize it. I finally just connected via Bluetooth BUT I didn't want to. I want to use the dongle. The mouse is logitech, the dongle is logitech, "options" is logitech, there's no reason for all three not to work together.

Other than that, so far, that's all the feedback I have for this. Everything else seems to be working as expected.