private LoginResult Login()

in Microsoft.Dynamics365.UIAutomation.Api.UCI/WebClient.cs [141:202]
48 lines of code
14 McCabe index (conditional complexity)

        private LoginResult Login(IWebDriver driver, Uri uri, SecureString username, SecureString password, SecureString mfaSecretKey = null, Action<LoginRedirectEventArgs> redirectAction = null)
        {
            bool online = !(OnlineDomains != null && !OnlineDomains.Any(d => uri.Host.EndsWith(d)));
            driver.Navigate().GoToUrl(uri);

            if (!online)
                return LoginResult.Success;

            driver.ClickIfVisible(By.Id(Elements.ElementId[Reference.Login.UseAnotherAccount]));

            bool waitingForOtc = false;
            bool success = EnterUserName(driver, username);
            if (!success)
            {
                var isUserAlreadyLogged = IsUserAlreadyLogged();
                if (isUserAlreadyLogged)
                {
                    SwitchToDefaultContent(driver);
                    return LoginResult.Success;
                }

                ThinkTime(1000);
                waitingForOtc = GetOtcInput(driver) != null;

                if (!waitingForOtc)
                    throw new Exception($"Login page failed. {Reference.Login.UserId} not found.");
            }

            if (!waitingForOtc)
            {
                driver.ClickIfVisible(By.Id("aadTile"));
                ThinkTime(1000);

                //If expecting redirect then wait for redirect to trigger
                if (redirectAction != null)
                {
                    //Wait for redirect to occur.
                    ThinkTime(3000);

                    redirectAction.Invoke(new LoginRedirectEventArgs(username, password, driver));
                    return LoginResult.Redirect;
                }

                EnterPassword(driver, password);
                ThinkTime(1000);
            }

            int attempts = 0;
            bool entered;
            do
            {
                entered = EnterOneTimeCode(driver, mfaSecretKey);
                success = ClickStaySignedIn(driver) || IsUserAlreadyLogged();
                attempts++;
            }
            while (!success && attempts <= Constants.DefaultRetryAttempts); // retry to enter the otc-code, if its fail & it is requested again 

            if (entered && !success)
                throw new InvalidOperationException("Something went wrong entering the OTC. Please check the MFA-SecretKey in configuration.");

            return success ? LoginResult.Success : LoginResult.Failure;
        }