Troubleshooting AWS Network Load Balancer Setup

I need assistance with my AWS Network Load Balancer. I've configured and registered the target group, and I'm using TCP for the protocol. However, I'm facing connection issues when trying to curl the URL.

Ideal Skills:
- Strong expertise in AWS Load Balancers
- Networking knowledge
- Security protocols understanding
- Proficient in Command Line Interface (CLI) commands

Please help me troubleshoot and resolve this issue.

I'm a student and am doing this for a job interview assignment.