SMS Gateway error HTTPS error 418


I can successfully send SMS via my https provider via webserver (so syntax is correct) but when I try via erpNEXT I receive the error below (with details changed as needed):

HTTPError: 418 Client Error: reauthentication required for url:

The syntax is correct, however the https error code maps to "I’m a teapot’ so hopefully there is a more sensible explanation for this error message!

Resolved, moved to a different SMS provider and all working!