(NoMethodError) Couldn't do view_request.role_name (our legacy js code does it though)

[la-ruby]

I'm trying to emulate some js code written by a previous dev.

// js code
let viewRequest = new docusign.RecipientViewRequest();
viewRequest.returnUrl = "https://acme.org/admin";
viewRequest.authenticationMethod = "none";
viewRequest.email = "[email protected]";
viewRequest.userName =  "John Doe";
viewRequest.roleName = "CEO";
viewRequest.clientUserId = USER_ID;

# ruby code
view_request = DocuSign_eSign::RecipientViewRequest.new
view_request.return_url = "https://acme.org/admin"
view_request.authentication_method = 'none'
view_request.email = "[email protected]"
view_request.user_name = "John Doe"
view_request.role_name = "CEO" # Why npm package supports this but gem doesnt
view_request.client_user_id = USER_ID

I get NoMethodError (undefined method `role_name=' for #<DocuSign_eSign::RecipientViewRequest:0x000000011c8ce278
How was the js developer able to set the role_name, and I cannot?