Stbemu on firestick - adult pin code

Hi, i have tried entering the adult pin code to access vod files on stbemu free and pro latest versions on my firestick. I'm doing that using stbemu's default inbuilt keyboard. Nothing happens, can't see any numbers entered. I have even tried to use my phone as the remote but still the same.

However, when I installed stbemu on my android phone I was able to enter the pin code on my phone.

I'm wondering if it's a version issue on my firestick or something else.

Please help!