Hello everyone.
The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
Answers
Try rebooting your PC and HoloLens.
https://forums.hololens.com/discussion/comment/5915#Comment_5915
If that does not work, there might be something wrong with your configuration.
1) Double-check that you have the latest version of VS installed with the Windows 10 SDK:
2) Verify that 'Developer Mode' is turned on for both your PC and HoloLens.
3) Verify that you installed the matching UWP Runtime with your version of Unity.
If you have multiple versions of VS and/or Unity on your machine, you might need to uninstall them and then re-install the latest versions to get into a clean state. Hopefully you won't need to go that far, but it worked for other forums users:
https://forums.hololens.com/discussion/comment/2262#Comment_2262