Probleme with hot key activation

hello. i have a problem with teamspeak. i have windows 10 home edition on my pc and i already downloaded the program. but now when i what to use my microphone( with the same settings from last time) i dont know why but it doesent work. so what i did last time was : go to tools, option, capture, activation, selected the push-to-talk and when i wanted to set the hotkey it tells me that the " space" or whatever button i ve chosen was set but when i go to see if it works… nothing happens. i wanted to use the “space” button to turn off-on my microfone. before i upgraded the windows it worked but now… is something that i did wrong or something that i forgot to do? thanks