• Srihari Nama Ananda Kumar
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We are trying to do Bulk Upsert for Contacts and map all the new contacts that are are upserted with an existing Account Id. So while preparing the CSV we are using Account.Id and the value is the actual Id of the account for all CSV records. However I seem to get an error 
INVALID_FIELD:Field name provided, Id is not an External ID or indexed field for Account:--

As per the documentation https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/datafiles_csv_rel_field_header_row.htm any indexed fields can be used. And Describe response for account clearly says idLookup property for Id field is set to true. Can anybody help why this is failing?