Get learnername, coursename and coursedate from Cornerstone LMS

The javascript code below gets the learner name from Cornerstone on demand, using SCORM 2004 format.
1) create 3 text variables in storyline: first_name, last_name, full_name
2) create text fields that show the content of the variables
3) create a button to execute the code
4) publish the course in SCORM 2004 format
5) run the course in Cornerstone and execute the code
6) you will see the name(s) 

(Note: I am struggling with getting the learner name with a course in xAPI format in Cornerstone on demand. Maybe someone can help.)

Here is the working code:

function findLMSAPI(win) {
    if (win.hasOwnProperty("GetStudentName")) return win;
    else if (win.parent == win) return null;
    else return findLMSAPI(win.parent);
}

var lmsAPI = findLMSAPI(this);
if (lmsAPI) {
    var player = GetPlayer();
    var name = lmsAPI.GetStudentName(); // z. B. "Max Mustermann" oder "Mustermann, Max"
    console.log("Name vom LMS:", name);

    var firstName = "";
    var lastName = "";

    if (name.includes(",")) {
        // Format: "Nachname, Vorname"
        var parts = name.split(", ");
        lastName = parts[0];
        firstName = parts[1];
    } else {
        // Format: "Vorname Nachname"
        var parts = name.split(" ");
        firstName = parts[0];
        lastName = parts.slice(1).join(" "); // Falls mehrere Nachnamen
    }

    player.SetVar("first_name", firstName);
    player.SetVar("last_name", lastName);
    player.SetVar("full_name", firstName + " " + lastName);
} else {
    console.error("LMS API nicht gefunden.");
}

Post the code that isn't working, 

Have you tried this solution?