For this error, the field in question is not accessible to the user profile in Financial Force for the user whose credentials were used to make the connection within Expensify. 

To correct this, go to Setup > Build > expand Create > Object

Then go to Payable Invoice > Custom Fields and Relationships

Select the field listed in the error message

Click View Field Accessibility 

Then, find employee profile in the list and select Hidden

Make sure both options for Visible are selected

Once this step has been completed, sync the connection within Expensify by going to Admin > [policy name] > Connections > Sync Now and then attempt to export the report again. 

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