Mobile App Google Signup Fix

I have a mobile application designed for Android using Java/Kotlin. However, the Google signup feature isn't working as expected. I expect that after resolving this issue, users can sign up using their Google account without any errors.

Key requirements:
- Resolve the Google signup issue on my existing Android app
- Ensure users can sign up using their Google account smoothly
- Thorough testing to ensure the fix is working correctly

Ideal skills include:
- Proficiency in Java/Kotlin for Android development
- Prior experience resolving Google signup issues
- Strong testing and debugging skills
Web panel is in php