We are trying to connect ArcGIS Enterprise 11.3 to ACC. We have followed the steps up until -
Authorize the APS application for the Autodesk Construction Cloud account. Step 1 says to follow the steps in Scenario 1. However this talks about BIM360. For this porject we are using ACC and not BIM360.
We are continually getting this error

when trying to create an account, we have checked the callback URL etc, and have checked whitelists between servers etc.
Do we have to do the steps for Scenario 1 when we are using ACC and not BIM360, the instructions aren't very clear, we have setup everything in APS but maybe missing the part where we link projects?
Any help greatly appreciated