Known factories: (none) means the map came back empty, not that the name is wrong. There are two ways to get an empty map and neither of them is a missing file:
data.factories is not set in sdods.project.yaml. With no path configured the loader returns an empty map without looking at anything, and the fallback text in the hint is a suggestion, not the path it tried.
The path is set, the file is there, but it does not default-export the map. A named export const user = ... is not found — the loader takes default or a named factories export.
And the path resolves against the project root, not the repo root, so ./data/factories.ts means projects/<slug>/data/factories.ts. We had it pointing one directory too high for a month and never noticed because the empty map is not an error.