Enter and Backspace keys don't function when controlling remote screen

When controlling a remote screen the enter and backspace keys don’t work. There may be others as well, but I haven’t run across them yet. Is there a setting or something I am missing? IIs anyone else having this issue? Is there anything I need to do to get them to function properly? I use other conferencing software and they work fine. I only have this issue on this software. My FCC is up to date