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Nils K. I have the same issue. Admin panel is using localhost and not my custom url configured in the .env. I don't have a workaround yet. Also, I cannot build the admin panel inside the docker container due to an error. I have created an issue here: https://forum.strapi.io/t/strapi-v4-build-and-cache-folders-does-not-exists-inside-docker-container/19764