After inputting the 6-digit pin-code, the dialog just disappears and the printer does not show up.
In Chrome Developer tools I can further see a 404 request to: https://digitalfactory.ultimaker.com/api/account/organizations/current
With this response:
{"errors": [{"id": "f5657f76-3a1d-4b22-950d-40a57bf0705e", "code": "recordNotFound", "http_status": "404", "title": "The given record does not exist.", "meta": {"record_name": "organization", "translatable": "The given %{record_name} does not exist.", "error_type": "ValidationError", "url": "https://digitalfactory.ultimaker.com/api/account/organizations/current"}}]}
Printer: UltiMaker S3
Firmware: 5.8.1
Connection: Ethernet