As usual, the solution was simple but difficult to spot 
We were using the wrong Client-Id for the request
The simplest things are the hardest to figure out…
Thank you for your help Barry and apologies for wasting your time here.
As usual, the solution was simple but difficult to spot
We were using the wrong Client-Id for the request
The simplest things are the hardest to figure out…
Thank you for your help Barry and apologies for wasting your time here.