How to connect two phones via SSH with a central SSH server?

I have two phones A and B which use Mobile Data. I would like to connect from phone A to phone B, the latter has an SSH server running on port 8022. The central SSH server is running on AWS and has an Elastic IP. Phone A can connect to AWS Server directly at port 22, so can phone B. AWS Server configuration:

GatewayPorts yes
TCP forward yes
Password Authentication Yes

Further, I have forwarded port 9099 on the AWS SSH server to local port 8022 on phone B:

~$ ssh -NR 9099:localhost:8022 user@Remoteip

By running netstat -tpln on the AWS SSH server, I can see that 9099 is in listening mode. But when I ssh from phone A into the AWS server at port 9099, it says timed out.