If you move your question to the Products section you will get a lot more traction on this. This section is designed for help with the online community website. Poorly named and everyone does it, but most people just look there.
In reply to myself - I needed to create a Role that had API access rights as none of the default roles could access the API (didn't realise that was the case, assumed Admin would have access)
Now that's been added it seems to work.