diff --git a/FirebaseAuth/Sources/Swift/AuthProvider/PhoneAuthProvider.swift b/FirebaseAuth/Sources/Swift/AuthProvider/PhoneAuthProvider.swift
index 9bd0094dcbe..9628876c8c2 100644
--- a/FirebaseAuth/Sources/Swift/AuthProvider/PhoneAuthProvider.swift
+++ b/FirebaseAuth/Sources/Swift/AuthProvider/PhoneAuthProvider.swift
@@ -199,7 +199,7 @@ import Foundation
       }
 
       let recaptchaVerifier = AuthRecaptchaVerifier.shared(auth: auth)
-      try await recaptchaVerifier.retrieveRecaptchaConfig(forceRefresh: false)
+      try await recaptchaVerifier.retrieveRecaptchaConfig(forceRefresh: true)
 
       switch recaptchaVerifier.enablementStatus(forProvider: .phone) {
       case .off:
@@ -321,7 +321,7 @@ import Foundation
           try await recaptchaVerifier.injectRecaptchaFields(
             request: request,
             provider: .phone,
-            action: .startMfaEnrollment
+            action: .mfaSmsEnrollment
           )
           let response = try await AuthBackend.call(with: request)
           return response.phoneSessionInfo?.sessionInfo
@@ -333,7 +333,7 @@ import Foundation
           try await recaptchaVerifier.injectRecaptchaFields(
             request: request,
             provider: .phone,
-            action: .startMfaSignin
+            action: .mfaSmsSignIn
           )
           let response = try await AuthBackend.call(with: request)
           return response.responseInfo?.sessionInfo
diff --git a/FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift b/FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift
index 85802392052..14d8886cbd1 100644
--- a/FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift
+++ b/FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift
@@ -172,6 +172,7 @@ class AuthBackend: AuthBackendProtocol {
         // perhaps be modeled differently so that the failing unencodedHTTPRequestBody could only
         // be called when a body exists...
         postBody = try request.unencodedHTTPRequestBody()
+
       } catch {
         throw AuthErrorUtils.RPCRequestEncodingError(underlyingError: error)
       }
@@ -187,6 +188,7 @@ class AuthBackend: AuthBackendProtocol {
         withJSONObject: postBody,
         options: JSONWritingOptions
       )
+
       if bodyData == nil {
         // This is an untested case. This happens exclusively when there is an error in the
         // framework implementation of dataWithJSONObject:options:error:. This shouldn't normally
diff --git a/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/Enroll/StartMFAEnrollmentRequest.swift b/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/Enroll/StartMFAEnrollmentRequest.swift
index 3896ec14b3d..1a89dad6c3a 100644
--- a/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/Enroll/StartMFAEnrollmentRequest.swift
+++ b/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/Enroll/StartMFAEnrollmentRequest.swift
@@ -16,6 +16,18 @@ import Foundation
 
 private let kStartMFAEnrollmentEndPoint = "accounts/mfaEnrollment:start"
 
+/// The key for the "clientType" value in the request.
+private let kClientType = "clientType"
+
+/// The key for the reCAPTCHAToken parameter in the request.
+private let kreCAPTCHATokenKey = "recaptchaToken"
+
+/// The key for the "captchaResponse" value in the request.
+private let kCaptchaResponseKey = "captchaResponse"
+
+/// The key for the "recaptchaVersion" value in the request.
+private let kRecaptchaVersion = "recaptchaVersion"
+
 /// The key for the tenant id value in the request.
 private let kTenantIDKey = "tenantId"
 
@@ -79,4 +91,15 @@ class StartMFAEnrollmentRequest: IdentityToolkitRequest, AuthRPCRequest {
     }
     return body
   }
+
+  func injectRecaptchaFields(recaptchaResponse: String?, recaptchaVersion: String) {
+    // reCAPTCHA check is only available for phone based MFA
+    if let phoneEnrollmentInfo {
+      phoneEnrollmentInfo.injectRecaptchaFields(
+        recaptchaResponse: recaptchaResponse,
+        recaptchaVersion: recaptchaVersion,
+        clientType: clientType
+      )
+    }
+  }
 }
diff --git a/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/SignIn/StartMFASignInRequest.swift b/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/SignIn/StartMFASignInRequest.swift
index 1098c2ef4ea..78deb836896 100644
--- a/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/SignIn/StartMFASignInRequest.swift
+++ b/FirebaseAuth/Sources/Swift/Backend/RPC/MultiFactor/SignIn/StartMFASignInRequest.swift
@@ -57,4 +57,15 @@ class StartMFASignInRequest: IdentityToolkitRequest, AuthRPCRequest {
     }
     return body
   }
+
+  func injectRecaptchaFields(recaptchaResponse: String?, recaptchaVersion: String) {
+    // reCAPTCHA check is only available for phone based MFA
+    if let signInInfo {
+      signInInfo.injectRecaptchaFields(
+        recaptchaResponse: recaptchaResponse,
+        recaptchaVersion: recaptchaVersion,
+        clientType: clientType
+      )
+    }
+  }
 }
diff --git a/FirebaseAuth/Sources/Swift/Backend/RPC/Proto/Phone/AuthProtoStartMFAPhoneRequestInfo.swift b/FirebaseAuth/Sources/Swift/Backend/RPC/Proto/Phone/AuthProtoStartMFAPhoneRequestInfo.swift
index 274a7b97883..87d0d03f5be 100644
--- a/FirebaseAuth/Sources/Swift/Backend/RPC/Proto/Phone/AuthProtoStartMFAPhoneRequestInfo.swift
+++ b/FirebaseAuth/Sources/Swift/Backend/RPC/Proto/Phone/AuthProtoStartMFAPhoneRequestInfo.swift
@@ -26,6 +26,15 @@ private let kSecretKey = "iosSecret"
 /// The key for the reCAPTCHAToken parameter in the request.
 private let kreCAPTCHATokenKey = "recaptchaToken"
 
+/// The key for the "captchaResponse" value in the request.
+private let kCaptchaResponseKey = "captchaResponse"
+
+/// The key for the "recaptchaVersion" value in the request.
+private let kRecaptchaVersion = "recaptchaVersion"
+
+/// The key for the "clientType" value in the request.
+private let kClientType = "clientType"
+
 class AuthProtoStartMFAPhoneRequestInfo: NSObject, AuthProto {
   required init(dictionary: [String: AnyHashable]) {
     fatalError()
@@ -33,6 +42,9 @@ class AuthProtoStartMFAPhoneRequestInfo: NSObject, AuthProto {
 
   var phoneNumber: String?
   var codeIdentity: CodeIdentity
+  var captchaResponse: String?
+  var recaptchaVersion: String?
+  var clientType: String?
   init(phoneNumber: String?, codeIdentity: CodeIdentity) {
     self.phoneNumber = phoneNumber
     self.codeIdentity = codeIdentity
@@ -43,6 +55,15 @@ class AuthProtoStartMFAPhoneRequestInfo: NSObject, AuthProto {
     if let phoneNumber = phoneNumber {
       dict[kPhoneNumberKey] = phoneNumber
     }
+    if let captchaResponse = captchaResponse {
+      dict[kCaptchaResponseKey] = captchaResponse
+    }
+    if let recaptchaVersion = recaptchaVersion {
+      dict[kRecaptchaVersion] = recaptchaVersion
+    }
+    if let clientType = clientType {
+      dict[kClientType] = clientType
+    }
     switch codeIdentity {
     case let .credential(appCredential):
       dict[kReceiptKey] = appCredential.receipt
@@ -54,4 +75,11 @@ class AuthProtoStartMFAPhoneRequestInfo: NSObject, AuthProto {
     }
     return dict
   }
+
+  func injectRecaptchaFields(recaptchaResponse: String?, recaptchaVersion: String,
+                             clientType: String?) {
+    captchaResponse = recaptchaResponse
+    self.recaptchaVersion = recaptchaVersion
+    self.clientType = clientType
+  }
 }
diff --git a/FirebaseAuth/Sources/Swift/Utilities/AuthRecaptchaVerifier.swift b/FirebaseAuth/Sources/Swift/Utilities/AuthRecaptchaVerifier.swift
index 20ab4a6e397..e817f6b6631 100644
--- a/FirebaseAuth/Sources/Swift/Utilities/AuthRecaptchaVerifier.swift
+++ b/FirebaseAuth/Sources/Swift/Utilities/AuthRecaptchaVerifier.swift
@@ -59,8 +59,8 @@
     case getOobCode
     case signUpPassword
     case sendVerificationCode
-    case startMfaSignin
-    case startMfaEnrollment
+    case mfaSmsSignIn
+    case mfaSmsEnrollment
 
     // Convenience property for mapping values
     var stringValue: String { rawValue }