One guess: your terminal window is a fixed width and it is cutting off the port number.
In particular when you include region, the hostname becomes 3 characters longer than the usual: x.tcp.xx.ngrok.io vs x.tcp.ngrok.io, which fits the fact that you are seeing a port number that is 3 digits shorter than usual.
To get the right address, you have a couple options:
- Check your existing tunnel’s address would be to look at ngrok’s web inspection interface that runs at
http://localhost:4040. - Check the ngrok web dashboard for online tunnels here:
https://dashboard.ngrok.com/endpoints/status.
Port numbers for ngrok TCP addresses are always 5 digits.