Why the added customers to the Customers page under CHANNELS & PEOPLE, are not deleted?

[Sara Moazzezi Eftekhar]

Hello,

I am creating a Jira project from Rest API using Python and each time when I create a project, there are two constant names and email addresses added to the project in Customers page. I tried different solutions and different APIs from Jira documentation (https://developer.atlassian.com/cloud/jira/service-desk/rest/api-group-servicedesk/#api-rest-servicedeskapi-servicedesk-servicedeskid-customer-delete) such as: 

DELETE /rest/servicedeskapi/servicedesk/{serviceDeskId}/customer  

But these names and emails are still in that page. Can any one help me to fix this issue?

Thank you