Unable to obtain streaming API key, manage-applications portal does not show Streaming API option

I am trying to connect to the Companies House streaming API at stream.companieshouse.gov.uk. I have a working REST API key but receive 401 Invalid Authorization on the stream endpoint, which I understand requires a separate streaming API key.

I have attempted to register a streaming application via:

  • developer.company-information.service.gov.uk/manage-applications/add — only shows REST API application form, no Streaming API option

  • developer-specs.company-information.service.gov.uk/manage-applications/add — returns 404

The self-service registration path described in your streaming API authentication documentation does not appear to be available. Could you advise the correct process to obtain a streaming API key?