Hey there @lukerollans and @mko, welcome to the Community! After checking with our support team, I have been able to confirm that the messaging found on the Authenticate User section leveraging the POST /passwordless/verify is still correct, which is below:
This feature is disabled by default for new tenants as of 8 June 2017. Please see Application Grant Types for more information.
This means that the /passwordless/verify feature is no longer an available option and has been disabled. However we are investigating other alternatives for a suitable replacement but we don’t have an ETA on that solution as of yet. I apologize for any confusion on this subject.