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I have also tried these two easy fixes,

Connecting USB keyboard and hiding the 'this computer is being controlled by ...' banner to no avail, any help would be greatly appreciated 

I am also having this exact problem, using a chromebook with the app, I can connect with no issue and I have control of the mouse but keyboard input is absent. I am using the onscreen keyboard to get by at present but is obviously very tedious, can anyone shine any light on a possible remedy? Thanks