I am attempting to implement the Proxy for App Login detailed in the following:
ArcGIS Security and Authentication | ArcGIS for Developers
However, I am getting the error below when the proxy code is attempting to convert the token 'from a Portal token into a Server token':
{"error":{"code":400,"message":"Unable to generate token","details":["Unable to generate token for this server"]}}
The code is doing a GET to the following URI:
https://www.arcgis.com/sharing/generateToken?token=<token>&serverURL=https://services.arcgisonline.c...
Is there any reason why a token would not be able to be generated for https://services.arcgisonline.com?
