Troubleshoot: Invalid category reference key XX for subsidiary XX.
This message indicates that the user's subsidiary hasn't been enabled for the expense category in question in NetSuite.
Go to Setup > Accounting > Expense Categories.
Enable the subsidiary for the applicable expense category in NetSuite.
Edit the expense category for which the internal ID matches the reference key number listed in the Rydoo error message.
Mark the user's subsidiary in the Subsidiary list and Save.
Run configuration sync in Rydoo, then trigger the export again.