Apex Test Class Code Coverage Issue

Hello Folks,
I will be facing some test coverage related issue which I tried in multiple ways but still stuck on this Hopefully our community will help me to make understand where I did something wrong

Apex Class :- GetTeamsMeetingURL 

global class GetTeamsMeetingURL {
    @InvocableMethod(label='Get MS Teams Meeting URL' description='Returns a meeting URL For MS Teams')
    //global static List<String> makeApiCallout(List<List<String>> inputTeamsParms) 
     global static List<String> makeApiCallout()
    {
        // Setup the HTTP Initial Request
        HttpRequest req = new HttpRequest();
        Http http = new Http();
               
        //Setup the Headers, format the body, and call the MS Graph API
        req.setEndpoint('callout:MS_Azure_OnlineMeeting');
        req.setMethod('POST');
        req.setHeader('Content-Type','application/json');
        req.setHeader('Accept','*/*');
        req.setHeader('Accept-Encoding','gzip, deflate, br');
        
        /* Setup the Parameters for Meetings, subject, etc. */
        // Note: The initial demo only utilized title, further development can use other inputs. 
       /* system.debug('Array size  =' + inputTeamsParms.get(0).size());  
        String inTitle = '"' + inputTeamsParms.get(0).get(0) + '"';
        system.debug('inTitle =' + inTitle);    
        String inAgenda = '"' + inputTeamsParms.get(0).get(0) + '"';
        system.debug('inAgenda =' + inAgenda);               
        String inPwd = '"' + inputTeamsParms.get(0).get(1) + '"';
        system.debug('inPwd =' + inPwd);                
        String inStart = '"' + inputTeamsParms.get(0).get(2) + '"';
        system.debug('inStart =' + inStart);                
        String inEnd = '"' + inputTeamsParms.get(0).get(3) + '"';
        system.debug('inEnd =' + inEnd);*/
        
        // Setup the Body
        String reqHTTPString  =  '';
        //reqHTTPString = '{"subject":' + inTitle +'}';
        //reqHTTPString = '{"Subject":' + "DDI Training Registration"}'
         reqHTTPString =  '{"Subject":"DDI Training Registration"}';
        req.setBody(reqHTTPString);
        System.debug('The Request Body' +reqHTTPString);
        
        /* Send request to MS Teams Server */
        HTTPResponse res = http.send(req);
        System.debug('The Response' +res);
        System.debug('The Response Body Is : '+res.getBody());
        /* Parse Response from MS Team Server */
        JSONParser parser = JSON.createParser(res.getBody());
        String webLink;
        webLink = 'MSTeamsNotSetup';
        System.debug(weblink);
        System.debug('The Parser :'+parser);
            
        while (parser.nextToken() != null) {
        if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && (parser.getText() == 'joinWebUrl')) {
            parser.nextToken();
            System.debug('@@ParserNextToken' +parser.nextToken());
            System.debug('@@' +parser.getText());
            webLink = parser.getText();
            System.debug('Weblink' +webLink);
            System.debug('joinWebUrl= ' + webLink);
           
            }
        }
    
    // Apex Actions Return. The method signature for invocable method requires a List of Strings to be returned. 
    // 
     System.debug('Weblink: '+webLink);
    return new List<String>{webLink};
    }
}

HttpMockClass :- HttpMockFactory

@isTest
global  class HttpMockFactory implements HttpCalloutMock{
    protected Integer Code;
    protected String Status;
    protected String Body;
    public HttpMockFactory(Integer Code, String Status,  String Body){
        this.Code = Code;
        this.Status = Status;
        this.Body = Body;
    }
    
    public HttpResponse respond(HttpRequest req){
        HttpResponse response = new HttpResponse();
        response.setStatusCode(this.Code);
        response.setStatus(this.Status);
        response.setBody(this.Body);
        return response;
        
    }
    

}

Test Class :- TestAzure

@istest
 public class TestAzure {
    
    
    /* Test Method for Unit Testing Connection */
     @istest
    public static String getMeetingUrl()
    {
        HttpMockFactory mock = new HttpMockFactory(200 ,'OK','Result Found');
        Test.setMock(HttpCalloutMock.class, mock);
          GetTeamsMeetingURL.makeApiCallout();
       // System.assertEquals(result, 'Result Found');
        
        HttpRequest req = new HttpRequest();
        Http http = new Http();
               
        //Setup the Endpoint and append the name of the file
        req.setEndpoint('callout:MS_Azure_OnlineMeeting');
        //req.setEndpoint('https://graph.microsoft.com/v1.0/me/onlineMeetings');
        req.setMethod('POST');
        req.setHeader('Content-Type','application/json');
        req.setHeader('Accept','*/*');
        req.setHeader('Accept-Encoding','gzip, deflate, br');
        
        //Setup the JSON Body - in the test just set a subject, can add more through Postman or other tests
        req.setBody('{"subject":"Delegated User Test Meeting"}');        
        //req.setBody('{}');
        
        System.debug('Body: ' + req.getBody());
        System.debug('Endpoint Value: '+ req.getEndpoint());
        System.debug('Request: ' + req);
        
        HTTPResponse res = http.send(req);
        System.debug('Response Body: '+res.getBody());

        /* Parse Response */
        JSONParser parser = JSON.createParser(res.getBody());
        String webLink;
        webLink = 'MSTeamsNotSetup';
        while (parser.nextToken() != null) {
        if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) &&
        (parser.getText() == 'joinWebUrl')) {
            parser.nextToken();
            webLink = parser.getText();
            System.debug('joinWebUrl= ' + webLink);
            }
        }
    
    return webLink;
        
        
    }
}

Code Coverage which I will be getting is 80% but the test class is still failing .
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