Windows phone 8.1 target cant run in windows 10 device when upload to Store

[BrokenAngel]

Currently I had done a project which was build using this config

And I run succesfully on my Lumia 920 which had been upgrade to Windows 10 OS.

Then I publish to store and it successful pass through the process.
When it come to store , I using my 920 and download it , but it cant be downloaded and show some error
After that I contact with Microsoft to ask and their reply me this

[8:58:20 AM] Hello,

Thank you for contacting developer support! I understand that your application is only searching under Windows Phone 8.1 store instead of universally as expected. I have reviewed your application and found that the package was only compatible with Windows Phone 8.1, and thus only published to that platform. For more information on how to create a Universal Windows App, you may click here.

For additional assistance in publishing packages that may be published to multiple platforms, I would suggest contacting our technical forums. Once you have made a post there, our moderators, and potentially other developers, will respond in an effort to assist you with the issue you’ve encountered.

Create apps with the Universal Windows Platform - UWP applications | Microsoft Learn

So which mean that current project build by Unity cant run on windows 10 OS or I do something wrongly , can someone help me to explain

Thanks.

[Tautvydas-Zilys]

That’s strange… Could you reply to them and ask what’s the exact incompatibility with it? I can confirm I can see games made with Unity which are targeting Windows Phone 8.1 on several phones with windows phone 10 installed.