Add proper permissions to your Unity3D application

Unity doesn't automatically provide permissions for apps to access Hololens restricted features, so you need to add these manually. Please follow these steps:

1. Once you have built the application in Unity3D, open it in Visual Studio normally
2. Right click on Package.appxmanifest and open it with XML editor/view code
3. Add the restricted capabilities in the <Package /> section:
   ```xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"```
4. Make sure to add it also to the ignore list part: ```IgnorableNamespaces="..... rescap"```
5. Add the correct entry to the <Capabilities /> section for the SensorsExperimental:
   ```<rescap:Capability Name="perceptionSensorsExperimental" />

To read the official documentation, check it out from: https://docs.microsoft.com/en-us/windows/uwp/packaging/app-capability-declarations#restricted-capabilities