We are in Jira Cloud, Jira Service Management, project is Team Managed.
I am trying to get all information regarding the user from user name. I need account id, email address etc.
I receive empty body but API GET request works as intended from the browser:
In the response I only get header and not the body. The body is empty. The request status is 200 and I get all the header information but then "body[ ]". Again, this works in the browser.

