Hello @Ori thank you for your response. Doing what you suggested no longer returns 404 but still does not work as it returns a 403:
The replica returned an HTTP Error: Http Error: status 403 Forbidden, content type "", content: Request IDs must be for requests signed by the caller.
Which makes no sense since the whole point of this is to be able to sign in an airgapped machine, send it from a networked one and then on the same networked one check the result.