1 files changed, 13 insertions, 0 deletions
diff --git a/Firebase/Auth/Source/FIRAuth.m b/Firebase/Auth/Source/FIRAuth.m
index c4aa895..dc3154f 100644
--- a/Firebase/Auth/Source/FIRAuth.m
+++ b/Firebase/Auth/Source/FIRAuth.m
@@ -104,6 +104,14 @@ static NSString *const kUserKey = @"%@_firebase_user";
 static NSString *const kMissingEmailInvalidParameterExceptionReason =
     @"The email used to initiate password reset cannot be nil.";
 
+/** @var kHandleCodeInAppFalseExceptionReason
+    @brief The reason for @c invalidParameterException when the handleCodeInApp parameter is false
+        on the ActionCodeSettings object used to send the link for Email-link Authentication.
+ */
+static NSString *const kHandleCodeInAppFalseExceptionReason =
+    @"You must set handleCodeInApp in your ActionCodeSettings to true for Email-link "
+    "Authentication.";
+
 /** @var kPasswordResetRequestType
     @brief The action code type value for resetting password in the check action code response.
  */
@@ -1108,6 +1116,11 @@ static NSMutableDictionary *gKeychainServiceNameForAppName;
       [FIRAuthExceptionUtils raiseInvalidParameterExceptionWithReason:
           kMissingEmailInvalidParameterExceptionReason];
     }
+
+    if (!actionCodeSettings.handleCodeInApp) {
+      [FIRAuthExceptionUtils raiseInvalidParameterExceptionWithReason:
+          kHandleCodeInAppFalseExceptionReason];
+    }
     FIRGetOOBConfirmationCodeRequest *request =
         [FIRGetOOBConfirmationCodeRequest signInWithEmailLinkRequest:email
                                                   actionCodeSettings:actionCodeSettings