FME Desktop version: FME 2021.2
I was trying to follow this article on How to Create an ArcGIS Enterprise Portal Web Connection (OAuth 2.0)
(https://support.safe.com/hc/en-us/articles/25407772142733-How-to-Create-an-ArcGIS-Enterprise-Portal-Web-Connection-OAuth-2-0)
It was going well until I tried to 'test' before moving on to Step 3 and I got the following error (see also attached):
Unable to Retrieve access token
Request to update access token failed. HTTP Error HTTP/1.1 401 Unauthorized
Does anyone know what this error in referring to?