ERR_NGROK_311: This address is allocated for a different region - ngrok documentation

What does ERR_NGROK_311 mean?

ngrok returns ERR_NGROK_311 with this message:

This address is allocated for a different region.
Failed to create an endpoint with the address <ADDR> in region <WANT> because it is reserved
in the <HAVE> region.

Try connecting to a different region: https://ngrok.com/docs/platform/pops

Where can I get more help with ERR_NGROK_311?

Email support@ngrok.com and include the error code.