Mouse Control Not Working Even After Giving Access To A Participant

Hello! I was wondering if you have any ideas why the mouse control in the screen share option is not working on my participant's end. I already gave remote control access to the participant. Although I can see the mouse moving on his/her end, it doesn't perform the function to "CLICK" or select whatever you want to do with the accessed screen.  In short, the mouse control access given to the participant only lets him/her move the mouse and nothing else. Please help.