Cannot Invoke Virtual Keyboard in any AOSP Android Scanner, only on Google Stock Android
No problem using it on any Android GMS devices whatever OS version. the Virtual Keyboard works (appears /invoke) when an input box will be focused.
BUt it does not work on any AOSP Android installed mostly on some Android Industrial Scanners which doesnt have a physical keyboards on it. Even if you push the ABC key, it hides the RDP default keyboards but nothing happens when it invokes the virtual keyboard to show.
I'll suggest to add an alphabet keys on rdp keyboard instead of relying to the virtual keyboard, if we cant resolve it.
GMS Device (Google Stock Android / Custom) below
AOSP Android below: