the ability to send remote keys is very important. it would be nice if we could type the key combination we wanted to sendunder the action menu . for example typing ctrl+alt+F2 could send that key combination to the remote computer
found a work around, at least for xorg, not sure of a comparable solutin for waland. from a terminal issue the command
setxkbmap -option srvrkeys:none
this will disable your current session from captureing ctrl-alt-Fn and will allow teamviewer to capture the keys and send them to the remote computer. when you are done, if you have not set any special options issues the command
setxkbmap -option ''
to restore the default behavior. If you have used setxkbmap to set things up special you can rerun the appropriate commands after clearing out the sesstings