Hello all, we had a similar issue here. We checked the traffic with Fiddler and we realised that ArcGIS Pro was trying to access the: .../portal/home/sharing/rest/oauth2/token%20HTTP/1.1 which is incorrect. The correct URL is: .../portal/sharing/rest/oauth2/token%20HTTP/1.1 (without the /home/ ). We fixed the issue on the ...portal/portaladmin/system./properties. The Properties variable should be set to {} and not include the incorrect path. I hope that helps! Stratos
... View more