diff --git a/PediFoods.xcodeproj/project.pbxproj b/PediFoods.xcodeproj/project.pbxproj
index 077e564..9f006ab 100644
--- a/PediFoods.xcodeproj/project.pbxproj
+++ b/PediFoods.xcodeproj/project.pbxproj
@@ -981,6 +981,7 @@
 		388EFAF707AD295240B9E951 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APP_ATTEST_ENVIRONMENT = production;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
@@ -1025,6 +1026,7 @@
 		4424276379B7A6A98892CFBC /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APP_ATTEST_ENVIRONMENT = development;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
diff --git a/PediFoods/PediFoods.entitlements b/PediFoods/PediFoods.entitlements
index e267110..e6f7ec8 100644
--- a/PediFoods/PediFoods.entitlements
+++ b/PediFoods/PediFoods.entitlements
@@ -4,7 +4,11 @@
 <dict>
 	<key>aps-environment</key>
 	<string>development</string>
+	<key>com.apple.developer.devicecheck.app-attest-opt-in</key>
+	<array>
+		<string>CDhash</string>
+	</array>
 	<key>com.apple.developer.devicecheck.appattest-environment</key>
-	<string>development</string>
+	<string>$(APP_ATTEST_ENVIRONMENT)</string>
 </dict>
 </plist>
diff --git a/PediFoods/Services/GuestSessionService.swift b/PediFoods/Services/GuestSessionService.swift
index 869c3ed..411bace 100644
--- a/PediFoods/Services/GuestSessionService.swift
+++ b/PediFoods/Services/GuestSessionService.swift
@@ -93,6 +93,7 @@ actor GuestSessionService {
 
 #if os(iOS)
     private func refreshTokenWithAppAttest() async throws -> String {
+        print("[GuestSessionService] DCAppAttestService.isSupported = \(DCAppAttestService.shared.isSupported), existingKeyId = \(store.appAttestKeyId ?? "nil")")
         guard DCAppAttestService.shared.isSupported else {
             // Simulator can never support App Attest (hardware limitation,
             // not environment-specific) — server has its own documented
@@ -112,6 +113,15 @@ actor GuestSessionService {
                 // other error (network blip, timeout, decode issue) must
                 // NOT wipe a perfectly valid registered key.
                 store.appAttestKeyId = nil
+            } catch let error as DCError {
+                // DeviceCheck itself rejects the key locally (e.g. the app
+                // was reinstalled and the Secure Enclave key backing this
+                // keyId no longer exists) - distinct from the server
+                // rejecting it, but equally unrecoverable without a fresh
+                // key. Without this, generateAssertion fails the same way
+                // forever since appAttestKeyId is never cleared.
+                print("[GuestSessionService] existing key rejected locally, re-attesting with a fresh key: \(error)")
+                store.appAttestKeyId = nil
             }
         }
 
@@ -141,9 +151,22 @@ actor GuestSessionService {
     }
 
     private func handshakeWithFreshAttestation(challenge: String) async throws -> String {
-        let keyId = try await DCAppAttestService.shared.generateKey()
+        let keyId: String
+        do {
+            keyId = try await DCAppAttestService.shared.generateKey()
+        } catch {
+            print("[GuestSessionService] generateKey failed: \(error)")
+            throw error
+        }
+
         let clientDataHash = Data(SHA256.hash(data: Data(challenge.utf8)))
-        let attestationObject = try await DCAppAttestService.shared.attestKey(keyId, clientDataHash: clientDataHash)
+        let attestationObject: Data
+        do {
+            attestationObject = try await DCAppAttestService.shared.attestKey(keyId, clientDataHash: clientDataHash)
+        } catch {
+            print("[GuestSessionService] attestKey failed: \(error)")
+            throw error
+        }
 
         let payload = GuestSessionAttestPayload(
             platform: "ios",
@@ -175,7 +198,13 @@ actor GuestSessionService {
 
     private func handshakeWithAssertion(keyId: String, challenge: String) async throws -> String {
         let clientDataHash = Data(SHA256.hash(data: Data(challenge.utf8)))
-        let assertionObject = try await DCAppAttestService.shared.generateAssertion(keyId, clientDataHash: clientDataHash)
+        let assertionObject: Data
+        do {
+            assertionObject = try await DCAppAttestService.shared.generateAssertion(keyId, clientDataHash: clientDataHash)
+        } catch {
+            print("[GuestSessionService] generateAssertion failed: \(error)")
+            throw error
+        }
 
         let payload = GuestSessionAttestPayload(
             platform: "ios",
diff --git a/PediFoods/Views/Main/PublicLocationPickerView.swift b/PediFoods/Views/Main/PublicLocationPickerView.swift
index 085b911..f5263e1 100644
--- a/PediFoods/Views/Main/PublicLocationPickerView.swift
+++ b/PediFoods/Views/Main/PublicLocationPickerView.swift
@@ -161,6 +161,7 @@ struct PublicLocationPickerView: View {
                 errorMessage = "Nenhum estado disponível no momento."
             }
         } catch {
+            print("[PublicLocationPickerView] loadLocations failed: \(error)")
             errorMessage = "Não foi possível carregar. Tente novamente."
         }
         isLoading = false