I can not subscribe for Partner Launch

Welcome to Microsoft Community.  

Thank you for posting an inquiry about a Partner Launch issue.

While I wish I could granularly address the issues you've encountered, members of the Answers community are not specialists in the Partner Center space. We do not have access to any backend related services or systems.

In some early cases, some community members who have experienced similar issues speculated that you may need to prepare an additional developer account for the platform in advance.

Steps to open a Windows developer account in Partner Center - Windows apps | Microsoft Learn

For more in-depth analysis, it is more appropriately posted on Microsoft Learn. The more experienced community may be able to provide more appropriate insights.

Here are links to the forums where you can raise specific scenarios and share your idea to help analyze the problem.  

Microsoft Partner Center - Microsoft Q&A

Category: Microsoft Partner Community | Microsoft Community Hub

Partner Center

Thanks for your patience and understanding. 

Best Regards,  

Kyo.Y - MSFT | Microsoft Community Technical Support