https://forum.shopware.com/discussion/63002/plugin-routing-fehlerhaft
https://github.com/shopware/platform/issues/260
https://docs.shopware.com/en/shopware-platform-dev-en/getting-started/startup-guide
https://forum.shopware.com/discussion/61380/saleschannelmappingexception-error
tl;dr: Schau ob in deinen Einstellungen deine Domain eingetragen worden ist.