Hi @Kevin Montrose, I have just come back to this project (having been working on other things) - I have now updated my request to include the key (now hitting: api.stackexchange.com/2.0/me?site=stackoverflow&key=XXXXXXX) and including the access_token, but I am still getting the same "resulted in 400 (Bad Request)" Error - any other ideas or suggestions?

Great thanks - am going to try including my key in the request.

Thanks - I thought that the key was only required in cases where the access token is not being passed - the only thing I can find in the docs about is this: "Pass this as key when making requests against the Stack Exchange API to receive a higher request quota." Is there any documentation detailing that it is required?