Not able to install/deploy app in SharePoint Online

Hello

I am using the following code 1 for deploying the app by passing tenant credentials (user and pass). It is working expected. But when I try to deploy using code 2 using GetContextBySecret(client and secret id are added in app config), but getting an error as mentioned in next code 2. I know this can be done thru PowerShell. But we don't want to depend on any tenant credentials. How can we deploy using GetRealmFromTargetUrl? I googled and noticed that everyone suggested it thru PowerShell, Is this possible or not or is this possible MS Graph for deploying apps using CSOM?

Code 1

string userName = "email address removed for privacy reasons";
                string Password = "Asdefg";
                //bool response = false;
                Guid appId = new Guid("77b53b7c-1403-118f-9c0e-cdb6d12c335b");
                var SiteUrl = "https://tenant.sharepoint.com/sites/test";
                 using (ClientContext context = GetContextBySecret(SiteUrl))
                {
                    var securepwd = ConvertToSecureString(Password);
                    context.Credentials = new SharePointOnlineCredentials(userName, securepwd);

                    AppManager manager = new AppManager(context);
                    if (manager.GetAvailable(appId) != null)
                    {
                        try
                        {
                            Task installTask = Task.Run(async () => await manager.InstallAsync(appId));
                            installTask.Wait();
                        }
                        catch (Exception ex)
                        {
                           logger.WriteLog(ex);                            
                        }
                    }
                }

Code 2

 Guid appId = new Guid("77b53b7c-1403-118f-9c0e-cdb6d12c335b");
                var SiteUrl = "https://tenant.sharepoint.com/sites/test";
                 using (ClientContext context = GetContextBySecret(SiteUrl))
                {
                    AppManager manager = new AppManager(context);

                    if (manager.GetAvailable(appId) != null)
                    {
                        try
                        {
                            Task installTask = Task.Run(async () => await manager.InstallAsync(appId));
                            installTask.Wait();
                        }
                        catch (Exception ex)
                        {
                           logger.WriteLog(ex);
                        }
                    }
                }
	  public static ClientContext GetContextBySecret(String url)
        {
            ClientContext cc = null;
            try
            {
                Uri siteuri = new Uri(url);
                string realm = TokenHelper.GetRealmFromTargetUrl(siteuri);
                var token = TokenHelper.GetAppOnlyAccessToken(TokenHelper.SharePointPrincipal, siteuri.Authority, realm).AccessToken;

                cc = TokenHelper.GetClientContextWithAccessToken(siteuri.ToString(), token);
            }
            catch (Exception ex)
            {
              //  logger.WriteLog(ex);
            }


            return cc;
        }

I can see App is added but in showing disabled mode, when I right click on app, I can see Detail, Monitor and Remove options and after click on monitor, I can see Install Error is showing as 1.

When I click on 1 error, I can see following error message

Can anyone please suggest what I am missing here? How to install app using code 2?

Regards

Avian