Amazon Alexa cant find any devices with a Deconz container installation on a Synology NAS

Hello, I hope someone can help me.
I’ve been running deconz/phoscon on a raspberry pi for years without any problems. I have now changed my system and run deconz on a synology container. Controlling the lamps and the web interface everything works wonderfully. Only Amazon’s Alexa can no longer find any devices. I read that it could have something to do with the ports but I only have a basic knowledge of networking.
I use deconzcommunity container as host with the default settings. I don’t know what to do next. Maybe someone can help me
thank you very much.