Client-side tracking with /v2/track fails with 401 Unauthorized if local authentication is disabled

• List of NuGet packages and version that you are using: Microsoft.ApplicationInsights.AspNetCore (v2.22.0), Azure.Identity (v1.12.0)
• Runtime version (e.g. net461, net48, netcoreapp2.1, netcoreapp3.1, etc. You can find this information from the *.csproj file): net8.0
• Hosting environment (e.g. Azure Web App, App Service on Linux, Windows, Ubuntu, etc.): Azure Web App, App Service on Linux, Windows via the .NET CLI locally

Describe the bug

If you disable local authentication for your AI resource, as it's recommended, then client-side tracking with /v2/track requests fail with HTTP 401 Unauthorized. This is after using SetAzureTokenCredential to configure a Service Principal, and using JavaScriptSnippet.FullScript.

Server-side tracking, as well as the Live Metrics control channel work (the latter is important because it shows the Service Principal working).

Enabling local authentication gets rid of this error.

I'd expect client-side tracking to work with local auth disabled too. The https://github.com/microsoft/ApplicationInsights-dotnet/issues/2795 issue hints on this having been the case at one point.

To Reproduce

This is a minimal MVC web app, generated with the VS template:

WebApplication1.zip

You can reproduce the issue by configuring an AI connection string in the appsettings.json file, configuring a Service Principal's details in Program, and running the app.

For Immediate Support

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Reproduce the failure using the minimal MVC app, its appsettings.json configuration, Program service-principal setup, JavaScriptSnippet.FullScript, and the /v2/track endpoint. Compare the behavior with issue 2795 and verify that client-side tracking succeeds when local authentication is disabled, while server-side tracking and Live Metrics continue to work.