no microphone option when answering on android

Hi, when I answer the ring on my android app the video comes up and there's only the option to turn sound on and no option to turn on the microphone. The app will not rotate either to portrait mode. When I just view in live mode, if I turn it to portrait then there is the microphone option and I can activate it no problem. I have an iPad and that has the microphone option there always. The app has all permissions allowed but it just doesn't give me the option to turn on the microphone when answering a ring. Has anyone else had this problem and have you fixed it.? Thanks, Andy.