diff --git a/WireNetwork/Sources/WireNetwork/APIs/Rest/AuthenticationAPI/AuthenticationAPIV0.swift b/WireNetwork/Sources/WireNetwork/APIs/Rest/AuthenticationAPI/AuthenticationAPIV0.swift
index 36cf6a7d1ef..d21ac3107cd 100644
--- a/WireNetwork/Sources/WireNetwork/APIs/Rest/AuthenticationAPI/AuthenticationAPIV0.swift
+++ b/WireNetwork/Sources/WireNetwork/APIs/Rest/AuthenticationAPI/AuthenticationAPIV0.swift
@@ -213,8 +213,7 @@ class AuthenticationAPIV0: AuthenticationAPI, VersionedAPI {
         let (data, response) = try await networkService.executeRequest(request)
 
         guard
-            let responseURL = response.url,
-            let responseHeaders = response.allHeaderFields as? [String: String]
+            response.allHeaderFields is [String: String]
         else {
             throw AuthenticationAPIError.invalidResponse
         }
@@ -239,7 +238,7 @@ class AuthenticationAPIV0: AuthenticationAPI, VersionedAPI {
             .withBody(body, contentType: .json)
             .build()
 
-        let (data, response) = try await networkService.executeRequest(request)
+        let (_, response) = try await networkService.executeRequest(request)
 
         guard
             let responseURL = response.url,
@@ -271,9 +270,9 @@ class AuthenticationAPIV0: AuthenticationAPI, VersionedAPI {
             .withBody(body, contentType: .json)
             .build()
 
-        let (data, response) = try await networkService.executeRequest(request)
+        let (_, _) = try await networkService.executeRequest(request)
 
-        try ResponseParser()
+        _ = ResponseParser()
             .success(code: .ok)
             .failure(code: .badRequest, label: "bad-request", error: AuthenticationAPIError.invalidEmail)
     }
diff --git a/WireNetwork/Sources/WireNetwork/Authentication/AuthenticationManager.swift b/WireNetwork/Sources/WireNetwork/Authentication/AuthenticationManager.swift
index 02b5bf2a75c..c8ed01deb74 100644
--- a/WireNetwork/Sources/WireNetwork/Authentication/AuthenticationManager.swift
+++ b/WireNetwork/Sources/WireNetwork/Authentication/AuthenticationManager.swift
@@ -45,14 +45,14 @@ public actor AuthenticationManager: AuthenticationManagerProtocol {
 
     private var currentToken: CurrentToken?
     private let clientID: String?
-    private let cookieStorage: any CookieStorageProtocol
-    private let networkService: any NetworkServiceProtocol
+    private let cookieStorage: any CookieStorageProtocol & Sendable
+    private let networkService: any NetworkServiceProtocol & Sendable
     private let onAuthenticationFailure: () -> Void
 
     public init(
         clientID: String?,
-        cookieStorage: any CookieStorageProtocol,
-        networkService: any NetworkServiceProtocol,
+        cookieStorage: any CookieStorageProtocol & Sendable,
+        networkService: any NetworkServiceProtocol & Sendable,
         onAuthenticationFailure: @escaping () -> Void
     ) {
         self.clientID = clientID
@@ -142,7 +142,7 @@ public actor AuthenticationManager: AuthenticationManagerProtocol {
     private func makeRenewTokenTask(
         lastKnownToken: AccessToken?
     ) -> Task<AccessToken, any Error> {
-        Task {
+        Task { @Sendable [cookieStorage, networkService, clientID] in
             let cookies = try await cookieStorage.fetchCookies()
 
             var requestBuilder = try URLRequestBuilder(path: "/access")
diff --git a/WireNetwork/Sources/WireNetwork/Network/NetworkStack/NetworkStack.swift b/WireNetwork/Sources/WireNetwork/Network/NetworkStack/NetworkStack.swift
index b8d7929696b..5ab4f0a4a44 100644
--- a/WireNetwork/Sources/WireNetwork/Network/NetworkStack/NetworkStack.swift
+++ b/WireNetwork/Sources/WireNetwork/Network/NetworkStack/NetworkStack.swift
@@ -68,11 +68,8 @@ public actor NetworkStack {
                 proxyCredentials: proxyCredentials
             )
             self.state = .ready(services)
-        } catch .proxyCredentialsRequired {
-            self.state = .awaitingProxyCredentials
         } catch {
-            // Xcode warns that this case will never be executed, but if
-            // we take it away, it complains that not all errors are handled.
+            self.state = .awaitingProxyCredentials
         }
     }
 
diff --git a/wire-ios/WireUITests/Helper/UserHelper.swift b/wire-ios/WireUITests/Helper/UserHelper.swift
index a74cab591e3..9967b1f72f8 100644
--- a/wire-ios/WireUITests/Helper/UserHelper.swift
+++ b/wire-ios/WireUITests/Helper/UserHelper.swift
@@ -81,7 +81,7 @@ class UserHelper {
             email: user.email,
             password: user.password
         )
-        cookieStorage.cookies = cookies
+        try await cookieStorage.storeCookies(cookies)
 
         // Get activation code
         let (activationCode, activationKey) = try await authenticationAPI.getActivationCode(
@@ -306,8 +306,8 @@ enum FilterConversationsByCriteria {
     case conversationType(ConversationType?)
 }
 
-private final class MockCookieStorage: CookieStorageProtocol {
-    var cookies: [HTTPCookie]
+private actor MockCookieStorage: CookieStorageProtocol {
+    private var cookies: [HTTPCookie]
 
     init() {
         self.cookies = []