Hey @Giorgio-Chiodi -- the hosted service does not provide administrators with the ability to directly access their server/instance, which is part of how we can maintain stability on our platform.
You can grant us access to a theme you created (if it is on npm), and we can install it for you, but we cannot ensure compatibility with them 🙂
@julian It's in a container created by the plugin which also is meant to tie it to the forum container. I think you are right that it can't interpret the address correctly as I just tried a clean install but this time with mongodb and that plugin and had the exact same issue.
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