I have web viewer in my app. I have issue to publish to ios. When I made the Tracking usage description as Blank, I have error as “Unexpected error occurred” and automatically close the app. If I enter the description in Tracking usage description, I have error as NSUserTrackingUsageDescription in App Privacy section, so I cannot forward to submit the app to ios. I do not use any Admob or location censor at all. Anyone know the solution for my case.
Do you require Location Services when using the `Web Viewer?
If YES, then you have to supply enough information in the policy section.
If NO, then switch it OFF from the Web Viewer property tab.
[Update]
I just reviewed the Web Viewer properties tab and it says Android only so this should not be the problem.

I do not use the Location Services at all. Do you have any direction or advice to set up App policy to remove NSUserTrackingUsageDescription and submit for review? I set up app policy and submit several times, but the Apple rejected again.
Before submitting the app to App Store, if you are not using any of the components / services that can cause tracking then make sure you delete the default text in the tracking box in the project settings page in Thunkable.

[Update]
Remember that BLE, Maps, Push Notification and Location Sensors are all regarded as tracking components.

If I use the web viewer and leave Tracking Usage Description as blank, it give an error as “Unexpected error occoured” when I open the app.
See this post. It should gives you guidelines of what to fill in App Store Connect to get over this issue.