diff --git a/api/modules/authserver/models/AuthenticationForm.php b/api/modules/authserver/models/AuthenticationForm.php
index e6775c9..c12df0b 100644
--- a/api/modules/authserver/models/AuthenticationForm.php
+++ b/api/modules/authserver/models/AuthenticationForm.php
@@ -29,11 +29,6 @@ class AuthenticationForm extends ApiForm {
      */
     public $password;
 
-    /**
-     * @var string
-     */
-    public $totp;
-
     /**
      * @var string
      */
@@ -47,7 +42,6 @@ class AuthenticationForm extends ApiForm {
     public function rules(): array {
         return [
             [['username', 'password', 'clientToken'], RequiredValidator::class],
-            [['totp'], 'string'],
             [['clientToken'], ClientTokenValidator::class],
             [['requestUser'], 'boolean'],
         ];
@@ -68,17 +62,31 @@ class AuthenticationForm extends ApiForm {
         // so we keep such behavior
         $attribute = strpos($this->username, '@') === false ? 'nickname' : 'email';
 
+        $password = $this->password;
+        $totp = null;
+        if (preg_match('/.{8,}:(\d{6})$/', $password, $matches) === 1) {
+            $totp = $matches[1];
+            $password = mb_substr($password, 0, -7); // :123456 - 7 chars
+        }
+
+        login:
+
         $loginForm = new LoginForm();
         $loginForm->login = $this->username;
-        $loginForm->password = $this->password;
-        $loginForm->totp = $this->totp;
-        if (!$loginForm->validate() || $loginForm->getAccount()->status === Account::STATUS_DELETED) {
-            $errors = $loginForm->getFirstErrors();
-            if (isset($errors['totp'])) {
-                Authserver::error("User with login = '{$this->username}' protected by two factor auth.");
-                throw new ForbiddenOperationException('Account protected with two factor auth.');
-            }
+        $loginForm->password = $password;
+        $loginForm->totp = $totp;
 
+        $isValid = $loginForm->validate();
+        // Handle case when user's password matches the template for totp via password
+        if (!$isValid && $totp !== null && $loginForm->getFirstError('password') === E::PASSWORD_INCORRECT) {
+            $password = "{$password}:{$totp}";
+            $totp = null;
+
+            goto login;
+        }
+
+        if (!$isValid || $loginForm->getAccount()->status === Account::STATUS_DELETED) {
+            $errors = $loginForm->getFirstErrors();
             if (isset($errors['login'])) {
                 if ($errors['login'] === E::ACCOUNT_BANNED) {
                     Authserver::error("User with login = '{$this->username}' is banned");
@@ -88,9 +96,14 @@ class AuthenticationForm extends ApiForm {
                 Authserver::error("Cannot find user by login = '{$this->username}'");
             } elseif (isset($errors['password'])) {
                 Authserver::error("User with login = '{$this->username}' passed wrong password.");
-            }
+            } elseif (isset($errors['totp'])) {
+                if ($errors['totp'] === E::TOTP_REQUIRED) {
+                    Authserver::error("User with login = '{$this->username}' protected by two factor auth.");
+                    throw new ForbiddenOperationException('Account protected with two factor auth.');
+                }
 
-            // TODO: эта логика дублируется с логикой в SignoutForm
+                Authserver::error("User with login = '{$this->username}' passed wrong totp token");
+            }
 
             throw new ForbiddenOperationException("Invalid credentials. Invalid {$attribute} or password.");
         }
diff --git a/api/tests/functional/authserver/AuthorizationCest.php b/api/tests/functional/authserver/AuthorizationCest.php
index 65cd480..d5ebefa 100644
--- a/api/tests/functional/authserver/AuthorizationCest.php
+++ b/api/tests/functional/authserver/AuthorizationCest.php
@@ -95,8 +95,7 @@ class AuthorizationCest {
     public function byEmailWithEnabledTwoFactorAuthAndCorrectToken(FunctionalTester $I) {
         $I->sendPOST('/api/authserver/authentication/authenticate', [
             'username' => 'otp@gmail.com',
-            'password' => 'password_0',
-            'totp' => TOTP::create('BBBB')->now(),
+            'password' => 'password_0:' . TOTP::create('BBBB')->now(),
             'clientToken' => Uuid::uuid4()->toString(),
         ]);
         $I->canSeeResponseCodeIs(200);
diff --git a/api/tests/unit/modules/authserver/models/AuthenticationFormTest.php b/api/tests/unit/modules/authserver/models/AuthenticationFormTest.php
index 1fa674c..6cef3b0 100644
--- a/api/tests/unit/modules/authserver/models/AuthenticationFormTest.php
+++ b/api/tests/unit/modules/authserver/models/AuthenticationFormTest.php
@@ -6,12 +6,13 @@ namespace codeception\api\unit\modules\authserver\models;
 use api\modules\authserver\exceptions\ForbiddenOperationException;
 use api\modules\authserver\models\AuthenticationForm;
 use api\tests\unit\TestCase;
+use common\models\Account;
 use common\models\OauthClient;
 use common\models\OauthSession;
 use common\tests\fixtures\AccountFixture;
 use common\tests\fixtures\OauthClientFixture;
 use OTPHP\TOTP;
-use Ramsey\Uuid\Uuid;
+use function Ramsey\Uuid\v4 as uuid4;
 
 class AuthenticationFormTest extends TestCase {
 
@@ -26,7 +27,7 @@ class AuthenticationFormTest extends TestCase {
         $authForm = new AuthenticationForm();
         $authForm->username = 'admin';
         $authForm->password = 'password_0';
-        $authForm->clientToken = Uuid::uuid4()->toString();
+        $authForm->clientToken = uuid4();
         $result = $authForm->authenticate()->getResponseData();
         $this->assertMatchesRegularExpression('/^[\w=-]+\.[\w=-]+\.[\w=-]+$/', $result['accessToken']);
         $this->assertSame($authForm->clientToken, $result['clientToken']);
@@ -55,9 +56,29 @@ class AuthenticationFormTest extends TestCase {
     public function testAuthenticateByValidCredentialsWith2FA() {
         $authForm = new AuthenticationForm();
         $authForm->username = 'otp@gmail.com';
-        $authForm->password = 'password_0';
-        $authForm->totp = TOTP::create('BBBB')->now();
-        $authForm->clientToken = Uuid::uuid4()->toString();
+        $authForm->password = 'password_0:' . TOTP::create('BBBB')->now();
+        $authForm->clientToken = uuid4();
+
+        // Just ensure that there is no exception
+        $this->expectNotToPerformAssertions();
+
+        $authForm->authenticate();
+    }
+
+    /**
+     * This is a special case which ensures that if the user has a password that looks like
+     * a two-factor code passed in the password field, than he can still log in into his account
+     */
+    public function testAuthenticateEdgyCaseFor2FA() {
+        /** @var Account $account */
+        $account = Account::findOne(['email' => 'admin@ely.by']);
+        $account->setPassword('password_0:123456');
+        $account->save();
+
+        $authForm = new AuthenticationForm();
+        $authForm->username = 'admin@ely.by';
+        $authForm->password = 'password_0:123456';
+        $authForm->clientToken = uuid4();
 
         // Just ensure that there is no exception
         $this->expectNotToPerformAssertions();
@@ -68,14 +89,19 @@ class AuthenticationFormTest extends TestCase {
     /**
      * @dataProvider getInvalidCredentialsCases
      */
-    public function testAuthenticateByWrongNicknamePass(string $expectedExceptionMessage, string $login, string $password) {
+    public function testAuthenticateByWrongCredentials(
+        string $expectedExceptionMessage,
+        string $login,
+        string $password,
+        string $totp = null
+    ) {
         $this->expectException(ForbiddenOperationException::class);
         $this->expectExceptionMessage($expectedExceptionMessage);
 
         $authForm = new AuthenticationForm();
         $authForm->username = $login;
-        $authForm->password = $password;
-        $authForm->clientToken = Uuid::uuid4()->toString();
+        $authForm->password = $password . ($totp ? ":{$totp}" : '');
+        $authForm->clientToken = uuid4();
         $authForm->authenticate();
     }
 
@@ -84,6 +110,7 @@ class AuthenticationFormTest extends TestCase {
         yield ['Invalid credentials. Invalid email or password.', 'wrong-email@ely.by', 'wrong-password'];
         yield ['This account has been suspended.', 'Banned', 'password_0'];
         yield ['Account protected with two factor auth.', 'AccountWithEnabledOtp', 'password_0'];
+        yield ['Invalid credentials. Invalid nickname or password.', 'AccountWithEnabledOtp', 'password_0', '123456'];
     }
 
 }