Employee bank account not populating on Expense Invoices

Hello,

We recently converted employee banking data into CoreHR, and can verify that the employees all have bank accounts showing in the Manage Bank Accounts page in Expenses and they are marked as Primary.

However, when these expense reports get interfaced to AP, the bank account number is blank and thus the payment fails with the "The value Document payee bank account number is required" error. As a result none of our employees can receive reimbursements as there is no remit-to-account to even select.

Why is this is happening?