Authentication fails when attempting to connect to ESRI ArcGIS Online feature service writer. After entering organizational credentials for AGOL, the error states "Failed to Obtain Refresh Token: Error retrieving access token". The translation log reads "java.lang.NoSuchFieldError:INSTANCE". I experienced this problem with FME desktop ESRI Edition v2017.0 and after upgrading to 2017.1 the issue still persists.
Solved
ArcGIS Online Authorization Issue FME Desktop 2017.1

Best answer by andreaatsafe
Hi @tderosa,
I'm pleased to let you know that this issue has been resolved. You can find the update in the latest release of FME 2017.
Please let me know if you are still encountering this issue after updating.
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