Deluge trying to Invite an Attendee via invokeURL

Deluge trying to Invite an Attendee via invokeURL

Hello,

I get the error "Execution Failed" while trying the following code:

params = {"sessionMembers":{"emailId":"#####","sessionId":"######","role":3,"source":1}};
file_variable = invokeurl
[
url :"https://showtime.zoho.eu/api/v4/#######/sessionMembers.json"
type :POST
parameters : params
connection:"creator_oauth_connection"
];
info file_variable;

SessionID exists and OrgID is set. Also the connection "creator_oauth_connection" is set with the right Oauth Scope "ZohoShowtime.sessionapi.CREATE".


Where is the problem or I'm doing wrong?