Call data from a feature layer of ArcGIS online (just the data table) to APPIAN,

i want to call data from a feature layer of ArcGIS online (just the data table) to APPIAN,
Fist I have created the OAuth 2.0 Credentials in ArcGIS for developers, then I'm trying to create a connected system in APPIAN to call that data, this are the parameter i have added:
  • Authentication: OAuth 2.0 Authorization code grant
  • Authorization Endpoint: www.arcgis.com/.../authorize
  • Client ID: X6nKvzhPa57iYtDy
  • Client Secret: ••••••••••••••••••••••••••••••••
  • Token Request Endpoint: www.arcgis.com/.../
i test the connected system, but show me this error (image bellow)
Help please.......

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