OOP Background task not firing in MAUI app for Windows on .NET 8 and .NET 9

[Mvk3aJKQh]

Description

The sample provided here by Microsoft is for WPF on .NET 6, and the background task works as expected. However, following the instructions in the README.md file for a MAUI app for Windows on .NET 8 and .NET 9 doesn't function. The task registration is recognized by Visual Studio in the lifecyle events menu, but it doesn't fire when selected, nor on the device TimeZoneChange trigger as expected. The README.md file does say "The packaging app is required for hosting out-of-process WinRT components." However, the "Create a Windows MSIX package." option is selected in this .NET 8 project, and was also selected in the .NET 9 project, though each project handles that setting a bit differently.

Steps to Reproduce

1. Deploy solution from repository (Be sure to read the README file)

Link to public reproduction project repository

https://github.com/Mvk3aJKQh/BackgroundTaskNET8

Version with bug

9.0.14 SR1.4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

Windows

Affected platform versions

Windows 10 build 19045.5487

Did you find any workaround?

No, currently not functional.

Relevant log output

[RoiChen001]

I can repro this issue at Windows platform on the latest 17.14.0 Preview 1.0(9.0.40 & 9.0.14 & 8.0.100).

[Mvk3aJKQh]

The payload bug isn't what I was reporting, though it should also be fixed. The bug I'm reporting is with the background task not firing. If you believe the issue results from this payload bug, then great. Otherwise, there still is the issue with the background task not firing.

[drasticactions]

Can you get your sample to work with a standard WinUI app? I don't believe this will be MAUI specific, outside of the default deployment for .NET 9 apps for MAUI WinUI is Unpackaged.

[Mvk3aJKQh]

Same problem in WinUI3 with and without a packaging project. Same payload bug, and same issue not firing the background task. However, Visual Studio is showing the registered background task in the lifecycle events menu in both solutions. Here is the repository with both WinUI3 solutions with and without a packaging project.

[Bricobit]

Any solution for this? I've been banging my head against the wall for a week trying to get background tasks and notifications on Windows and Android and I can't do it, it's very frustrating. I'm on the preview version of Visual Studio Community MAUI .NET 9 and there's nothing, no nugget that works for both platforms, and if I program it specifically for each platform I can't do it either, I don't know what else to try.