Can not access my port, get the error "I found your tunnel but couldn't connect to local app"

[ghun131]

I ran this command ssh -R 80:localhost:3000 localhost.run and see this error message on my browser

This is the error message from the terminal

[SuperZekes]

Make sure localhost:3000 is running by going to it in your browser. Then run the following command:

ssh -R 80:localhost:3000 nokey@localhost.run

[ghun131]

I tried it and now it gave me this

[SuperZekes]

Could be a firewall blocking it maybe? Not sure