diff --git a/FirebaseAuth/CHANGELOG.md b/FirebaseAuth/CHANGELOG.md
index 01e82591381..b9278b58399 100644
--- a/FirebaseAuth/CHANGELOG.md
+++ b/FirebaseAuth/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 11.15.0
+- [fixed] Fixed `Sendable` warnings introduced in the Xcode 26 beta. (#14996)
+
 # 11.14.0
 - [fixed] Synchronize internal `AuthKeychainServices` class to prevent
   crashes from concurrent access. (#14835)
diff --git a/FirebaseAuth/Sources/Swift/Auth/Auth.swift b/FirebaseAuth/Sources/Swift/Auth/Auth.swift
index 1f89d5ddfe4..3cfb87f41cc 100644
--- a/FirebaseAuth/Sources/Swift/Auth/Auth.swift
+++ b/FirebaseAuth/Sources/Swift/Auth/Auth.swift
@@ -863,29 +863,41 @@ extension Auth: AuthInterop {
                                          displayName: nil,
                                          idToken: nil,
                                          requestConfiguration: self.requestConfiguration)
-
       #if os(iOS)
-        self.wrapInjectRecaptcha(request: request,
-                                 action: AuthRecaptchaAction.signUpPassword) { response, error in
-          if let error {
+        Task {
+          do {
+            let response = try await self.injectRecaptcha(
+              request: request,
+              action: AuthRecaptchaAction.signUpPassword
+            )
+            self.internalCreateUserWithEmail(
+              request: request,
+              inResponse: response,
+              decoratedCallback: decoratedCallback
+            )
+          } catch {
             DispatchQueue.main.async {
               decoratedCallback(.failure(error))
             }
             return
           }
-          self.internalCreateUserWithEmail(request: request, inResponse: response,
-                                           decoratedCallback: decoratedCallback)
         }
       #else
-        self.internalCreateUserWithEmail(request: request, decoratedCallback: decoratedCallback)
+        self.internalCreateUserWithEmail(
+          request: request,
+          decoratedCallback: decoratedCallback
+        )
       #endif
     }
   }
 
-  func internalCreateUserWithEmail(request: SignUpNewUserRequest,
-                                   inResponse: SignUpNewUserResponse? = nil,
-                                   decoratedCallback: @escaping (Result<AuthDataResult, Error>)
-                                     -> Void) {
+  private func internalCreateUserWithEmail(request: SignUpNewUserRequest,
+                                           inResponse: SignUpNewUserResponse? = nil,
+                                           decoratedCallback: @escaping (Result<
+                                             AuthDataResult,
+                                             Error
+                                           >)
+                                             -> Void) {
     Task {
       do {
         var response: SignUpNewUserResponse
@@ -1161,12 +1173,15 @@ extension Auth: AuthInterop {
         requestConfiguration: self.requestConfiguration
       )
       #if os(iOS)
-        self.wrapInjectRecaptcha(request: request,
-                                 action: AuthRecaptchaAction.getOobCode) { result, error in
-          if let completion {
-            DispatchQueue.main.async {
-              completion(error)
-            }
+        Task {
+          do {
+            _ = try await self.injectRecaptcha(
+              request: request,
+              action: AuthRecaptchaAction.getOobCode
+            )
+            Auth.wrapMainAsync(completion, nil)
+          } catch {
+            Auth.wrapMainAsync(completion, error)
           }
         }
       #else
@@ -1234,12 +1249,15 @@ extension Auth: AuthInterop {
         requestConfiguration: self.requestConfiguration
       )
       #if os(iOS)
-        self.wrapInjectRecaptcha(request: request,
-                                 action: AuthRecaptchaAction.getOobCode) { result, error in
-          if let completion {
-            DispatchQueue.main.async {
-              completion(error)
-            }
+        Task {
+          do {
+            _ = try await self.injectRecaptcha(
+              request: request,
+              action: AuthRecaptchaAction.getOobCode
+            )
+            Auth.wrapMainAsync(completion, nil)
+          } catch {
+            Auth.wrapMainAsync(completion, error)
           }
         }
       #else
@@ -2289,21 +2307,6 @@ extension Auth: AuthInterop {
   }
 
   #if os(iOS)
-    private func wrapInjectRecaptcha<T: AuthRPCRequest>(request: T,
-                                                        action: AuthRecaptchaAction,
-                                                        _ callback: @escaping (
-                                                          (T.Response?, Error?) -> Void
-                                                        )) {
-      Task {
-        do {
-          let response = try await injectRecaptcha(request: request, action: action)
-          callback(response, nil)
-        } catch {
-          callback(nil, error)
-        }
-      }
-    }
-
     func injectRecaptcha<T: AuthRPCRequest>(request: T,
                                             action: AuthRecaptchaAction) async throws -> T
       .Response {
diff --git a/FirebaseAuth/Tests/Unit/Fakes/FakeBackendRPCIssuer.swift b/FirebaseAuth/Tests/Unit/Fakes/FakeBackendRPCIssuer.swift
index ec931c0c859..a3e7d12db48 100644
--- a/FirebaseAuth/Tests/Unit/Fakes/FakeBackendRPCIssuer.swift
+++ b/FirebaseAuth/Tests/Unit/Fakes/FakeBackendRPCIssuer.swift
@@ -153,13 +153,15 @@ final class FakeBackendRPCIssuer: AuthBackendRPCIssuerProtocol, @unchecked Senda
       requestData = body
       // Use the real implementation so that the complete request can
       // be verified during testing.
+      let requestURL = request.requestURL()
+      let requestConfiguration = request.requestConfiguration()
       completeRequest = Task {
         await AuthBackend
           .request(
-            for: request.requestURL(),
+            for: requestURL,
             httpMethod: requestData == nil ? "GET" : "POST",
             contentType: contentType,
-            requestConfiguration: request.requestConfiguration()
+            requestConfiguration: requestConfiguration
           )
       }
       decodedRequest = try? JSONSerialization.jsonObject(with: body) as? [String: Any]