To add: (I’m just going down the checklist here developers.cloudflare.com/…/connect-networks/)

• Can you show us that cloudflared is actually running. I wanna see it
• Does your firewall allow the connection

Here’s the troubleshooting page
…cloudflare.com/…/troubleshoot-tunnels/

• Have you gotten to the authentication step?

• What do the logs say?
  developers.cloudflare.com/…/diag-logs/