Program/V1/Services/PushService.cs

@@ -37,7 +37,9 @@ public class PushServiceWithP12
         };
         var jsonPayload = JsonSerializer.Serialize(payload);
         
-        var certificate = new X509Certificate2(p12Path, p12Password);
+        var certificate = new X509Certificate2(p12Path, p12Password,
+            X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.Exportable
+            );
         
         var handler = new HttpClientHandler();
         handler.ClientCertificates.Add(certificate);