Someone should test Logitech mouse software with a newly installed mouse and only the keyboard available for navigation.

In the Options program, I get the message "Wireless Mouse MX Master not supported in Options. Please use Options+ to configure it." yet the buttons "Add Device" and "Use in Options+" cannot be selected or navigated with the keyboard.

Opening the Options+ program brings up a modal purple dialogue that first asked for my feedback star rating 1-5 but it could not be selected with the keyboard. I reopened the program and it required a software update which could not be initiated with the keyboard.