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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?


 

Hi marronm, were you able to save the web service, then go to step 3 and create a web connection using that service. Upon clicking authenticate does it throw the same error as the ‘test’


Hi j.botterill, yes I can save the web service but when I move on to the next step and click ‘authenticate’, the same error appears.


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