Hello, Welcome to Microsoft Q&A,
You can troubleshoot in the following ways.
- For the project, how do you configure the MixedRealityToolkitProfile? For testing you can directly use the EyeTrackingDemoConfigurationProfile in MixedRealityToolkitExamples/Demos-EyeTracking. You can also refer to this profile and Eye Tracking Basic Setup - MRTK 2 | Microsoft Learn to configure your own profile.
- For deployment, please also check whether Eye Gaze Interaction Profile is added in XR Plug-in Managment->OpenXR->UWP->Interaction Profiles.
- For debugging in Unity, are you running directly in Unity or remotely debugging through Remote for Play Mode? If you are running directly in Unity, then it needs to be clarified that the default is to use HeadGaze instead of EyeGaze.
- For the device, please also check whether you have given this application permission in the device's Settings->Privacy->AppPermissions->Eye tracker.
----
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.