The process of creating immersive mixed reality applications for Microsoft HoloLens,
Ensure only MRTK3 is installed : Having both MRTK3 and MRTK2 package in the same project can lead to conflicts. Verify package installation. : Confirm that the Nonnative keyboard is included in your project. In MRTK3 it's located under packages > MRTK UX components > Experimental > NonNativeKeyboard