C# MAUI .NET8 self-signed certificate

Hi everyone, I've been searching everywhere and I can't make it work. I've made a C# MAUI windows app, I created a self-signed certificate and I would like to send my app to my friend so he can test it and give me feedbacks. I sent the certificate with the generated .msix file. I imported the certificate, but I still have an error when I want to install the app. It works fine on my desktop, but not on my desktop. Do you guys have any idea why please? 🙂