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the S3/filestate backends don't support projects or organisations. you need to call your stack `{project/name}` for example `pulumi stack init <http://vpc.dev|vpc.dev>

And can I extract the “dev” part out of it?

Or do I have to get that manually with “getStack()“?

`getStack()` wil return the full stack name, eg `<http://vpc.dev|vpc.dev>` - you can split that using whatever string split mechanism you want