Resolution:There was some issues with installation.Uninstalling and re-installing FME Desktop resolve the issue.
If there are any issues relating to installation please refer to this article to set up a clean installhttps://knowledge.safe.com/articles/962/re-installing-fme-if-there-is-a-problem-with-the-i.html
Thanks for you reply@rahulsharma.I sent the results in a support request.
@pijke, Can you try following
Re-authenticate the WebConnection "Envita GIS ArcGIS Online"
You mentioned existing Reader works, Can you try adding a reader to that existing workspace (please make a copy if that workspace is in production?
Can you confirm that you can access the feature using same credentials on WebUI?
Can you also clarify what version of FME Desktop are you using or is it Data Interop?
I think I would like to have a closer look at this, please file a support ticket here//www.baooytra.com/support/report-a-problem/, and Atten : Rahul and I can follow up with you.