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Cloudflare tunnel only requires outbound port opened, check if you've allowed all outbound ports in EC2 security group (the default VPC should have this already).
Otherwise it's probably a misconfiguration reaching the IP/port of the cloudflared service on the EC2. Have you tried checking cloudflared logs? Does your tunnel status show up as healthy?
He mentioned he was looking at cloudflare logs. So its making an out bound tunnel and when the ec2 firewall is on it doesnt make a connection. If its an outbound tcp connection he should still be able to do a packet capture and see if the handshake is being performed.
When it doesnt work, check the log files for the firewall block message.