Authentication to Azure AD without going through the login page in a web application

Hello,

I work on an application and I would like to incorporate Power BI reports. To do this, I must authenticate with Azure AD before any manipulation. The code below allows me to do it, except that I first need to go through the Azure login page. What I would like to do is to authenticate without going through the login page (in a totally transparent way for the user, directly in the code if possible). Here is the code I use.

Your help will be of great use to me

public ActionResult Index()
        {
            try
            {
                //Test for AuthenticationResult
                if (Session["authResult"] != null)
                {
                    //Get the authentication result from the session
                    authResult = (AuthenticationResult)Session["authResult"];
                    ViewData["token"] = authResult.AccessToken;

                    ViewData["reportUri"] = Properties.Settings.Default.reportUri;
                    //GetReports();
                }
                else
                {
                    //Connexion à Azure AD 
                    SignInAzureAD();
                }
            }
            catch (Exception ex)
            {

                throw ex;
            }
            return View();
        }

public void SignInAzureAD()
        {
            //Create a query string
            //Create a sign-in NameValueCollection for query string
            var @params = new NameValueCollection
                {
                    //Azure AD will return an authorization code. 
                    //See the Redirect class to see how "code" is used to AcquireTokenByAuthorizationCode
                    {"response_type", "code"},

                    //Client ID is used by the application to identify themselves to the users that they are requesting permissions from. 
                    //You get the client id when you register your Azure app.
                    {"client_id", Properties.Settings.Default.ClientID},

                    //Resource uri to the Power BI resource to be authorized
                    {"resource", Properties.Settings.Default.Resource},

                    //After user authenticates, Azure AD will redirect back to the web app
                    {"redirect_uri", Properties.Settings.Default.RedirectUrl}, 
                   
                };

            //Create sign-in query string
            var queryString = HttpUtility.ParseQueryString(string.Empty);
            queryString.Add(@params);

            //Redirect authority
            //Authority Uri is an Azure resource that takes a client id to get an Access token
            var authUri = String.Format("{0}?{1}", Properties.Settings.Default.authorityUri, queryString);
            Response.Redirect(authUri);
        }

public ActionResult Redirect()
        {
            //Redirect uri must match the redirect_uri used when requesting Authorization code.
            // Get the auth code
            string code = Request.Params.GetValues(0)[0];

            // Get auth token from auth code       
            TokenCache TC = new TokenCache();

            AuthenticationContext AC = new AuthenticationContext(Properties.Settings.Default.authorityUri, TC);
            ClientCredential cc = new ClientCredential
                (Properties.Settings.Default.ClientID,
                Properties.Settings.Default.ClientSecret);

            AuthenticationResult AR = AC.AcquireTokenByAuthorizationCode(code, new Uri(Properties.Settings.Default.RedirectUrl), cc);

            //Set Session "authResult" index string to the AuthenticationResult
            Session["authResult"] = AR;

            //Redirect back to Default.aspx
            Response.Redirect("/Dashboard/Index");
            return View("Index");
        }

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