When using Token-based authentication, the EAM application must be configured as followings to receive token from ArcGIS platform:
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GISAUTH install parameter must be >blank>.
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Navigate to the Users Setup screen. Save ESRI ArcGIS Server User and ESRI ArcGIS Server Password field values with the EAM user. This will allow an EAM application to generate a token and connect to the ArcGIS REST endpoint in a secure way.