Companies streaming API - 403 Forbidden


I’m trying to use this streaming API for the first time and am getting the following error;

GET>HTTP/1.1 403 Forbidden

I’ve set up the api key with my current IP Address i the developer hub.
i have added an authorization header to the request - “Authorization”,"Basic " + EncodeTo64( streamKey + “:” ))

Do you need to do anything at companies house to enable my access or is there something else i need to set up at my end ?

Many thanks

I’ve had more of a play with this and managed to get this working by removing the IP addresses from the key.