Automate Zoom Phone User Addition

I have an Okta push group for Zoom Phone users. When a user is assigned to that group, I want Workato to enable Zoom Phone for that user. I have tried the example here but get a ‘501 Not Implemented’ error. This is using this API endpoint.

How can I replicate the ‘Add’ option you get in the admin dashboard when you add a Zoom Phone user?

Thanks
Simon