I went looking in the play store yesterday for a Klingon keyboard. Something with all of the letters already capitalized, or not, as needed, with the combo letters already together and the such. I didn't have any luck. Does anyone know of such a keyboard?
I'm not sure about Win10, but for Android, if you download the AnySoftKeyboard and then add the quja' extension (both available in the Play Store), you can get a keyboard which already has the letters in the correct capitalization and the multigraphs on single keys. It also includes some options for pIqaD.
You seem to have figured it out, but in case someone else comes to this forum and wonders... pIqaD is the Klingon characters that are used to write Klingon instead of the Roman letters that Duolingo and most of the instructional materials use. quja' is the name of the Keyboard layout used when the quja' extension for AnySoftKeyboard is used, it has no other meaning in tlhIngan Hol that we know of. You can find it by searching for quja' in the play store, but it won't do anything unless you have AnySoftKeyboard installed and restart your device.