diff --git a/FirebaseAuth/CHANGELOG.md b/FirebaseAuth/CHANGELOG.md
index 795b602922e..53fae00d47a 100644
--- a/FirebaseAuth/CHANGELOG.md
+++ b/FirebaseAuth/CHANGELOG.md
@@ -1,7 +1,8 @@
 # Unreleased
 - [fixed] Fix a `fatalError` unenrolling from MFA. An invalid user token now throws an
   `invalidUserToken` error instead of crashing. (#14663)
-- [fixed] Fix the parameter from "languageCode" to "lang" in ActionCodeURL (#14664)
+- [fixed] Fix the parameter from "languageCode" to "lang" in ActionCodeURL. (#14664)
+- [fixed] Fix the parameters for requestType in ActionCodeOperation. (#14665)
 
 # 11.9.0
 - [changed] Using reCAPTCHA Enterprise and Firebase Auth requires reCAPTCHA
diff --git a/FirebaseAuth/Sources/Swift/ActionCode/ActionCodeInfo.swift b/FirebaseAuth/Sources/Swift/ActionCode/ActionCodeInfo.swift
index ee249699808..3cfa35909f6 100644
--- a/FirebaseAuth/Sources/Swift/ActionCode/ActionCodeInfo.swift
+++ b/FirebaseAuth/Sources/Swift/ActionCode/ActionCodeInfo.swift
@@ -42,12 +42,12 @@ import Foundation
   /// - Returns: The corresponding ActionCodeOperation for the supplied request type.
   class func actionCodeOperation(forRequestType requestType: String?) -> ActionCodeOperation {
     switch requestType {
-    case "PASSWORD_RESET": return .passwordReset
-    case "VERIFY_EMAIL": return .verifyEmail
-    case "RECOVER_EMAIL": return .recoverEmail
-    case "EMAIL_SIGNIN": return .emailLink
-    case "VERIFY_AND_CHANGE_EMAIL": return .verifyAndChangeEmail
-    case "REVERT_SECOND_FACTOR_ADDITION": return .revertSecondFactorAddition
+    case "resetPassword": return .passwordReset
+    case "verifyEmail": return .verifyEmail
+    case "recoverEmail": return .recoverEmail
+    case "signIn": return .emailLink
+    case "verifyAndChangeEmail": return .verifyAndChangeEmail
+    case "revertSecondFactorAddition": return .revertSecondFactorAddition
     default: return .unknown
     }
   }
diff --git a/FirebaseAuth/Tests/Unit/AuthTests.swift b/FirebaseAuth/Tests/Unit/AuthTests.swift
index fe7be777cc9..dc39e1448cb 100644
--- a/FirebaseAuth/Tests/Unit/AuthTests.swift
+++ b/FirebaseAuth/Tests/Unit/AuthTests.swift
@@ -538,7 +538,7 @@ class AuthTests: RPCBaseTests {
    */
   func testCheckActionCodeSuccess() throws {
     let kNewEmail = "newEmail@example.com"
-    let verifyEmailRequestType = "VERIFY_EMAIL"
+    let verifyEmailRequestType = "verifyEmail"
     let expectation = self.expectation(description: #function)
 
     // 1. Setup respond block to test and fake send request.