ASP.NET Zero User Authentication Fix

I'm facing critical user authentication issues with my ASP.NET Zero application. The problem manifests as login failures affecting all users without exception. This is a critical issue that needs to be resolved promptly to restore system functionality and user access.

Ideal Skills and Experience:
- Extensive experience with ASP.NET Zero
- Proficient in troubleshooting user authentication issues
- Strong background in .NET development
- Able to deliver solutions promptly and efficiently