diff --git a/mobile/tool/native_signing_probe.dart b/mobile/tool/native_signing_probe.dart
index 0c00c9bc33..c9c99f6c36 100644
--- a/mobile/tool/native_signing_probe.dart
+++ b/mobile/tool/native_signing_probe.dart
@@ -8,6 +8,15 @@ import 'package:buzz/shared/crypto/event_signer.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  try {
+    await runProbe();
+  } catch (error) {
+    debugPrint('SIGNING_PROBE FAILED: $error');
+    rethrow;
+  }
+}
+
+Future<void> runProbe() async {
   if (!Platform.isIOS) throw StateError('This probe requires an iOS Runner');
   final results = <String>[];
   final key = '0' * 63 + '3';
diff --git a/scripts/test-mobile-linked-signing.sh b/scripts/test-mobile-linked-signing.sh
index f02349161d..18b65fa724 100644
--- a/scripts/test-mobile-linked-signing.sh
+++ b/scripts/test-mobile-linked-signing.sh
@@ -24,6 +24,10 @@ for ((attempt = 0; attempt < 90; attempt++)); do
   xcrun simctl spawn "$device" log show --last 5m --style compact \
     --predicate "processIdentifier == $probe_pid AND eventMessage CONTAINS \"SIGNING_PROBE\"" \
     > "$fixture/probe.log" 2>/dev/null
+  if grep -q 'SIGNING_PROBE FAILED:' "$fixture/probe.log"; then
+    cat "$fixture/probe.log"
+    exit 1
+  fi
   if grep -q 'SIGNING_PROBE COMPLETE' "$fixture/probe.log"; then
     cat "$fixture/probe.log"
     exit 0