Fix JWT token Validation Issue : Android Mobile App

I'm seeking a developer to resolve a JWT token validation issue in my Android app.

Current Setup:
- JWT tokens are generated on the Node JS server.
- Tokens are supposed to be validated on the same Node JS server but are currently failing.

Requirements:
- Experience with Node JS, Java, and MongoDB.
- Strong understanding of JWT and authentication mechanisms.
- Ability to debug and fix token validation issues.

Ideal Skills:
- Node JS expertise
- JWT knowledge
- Android app security
- Problem-solving skills

Please provide relevant experience in your bids. Thank you!