Pre-pay Auditor unable to Approve Expense Reports 9.2

Hello,

I'm able to create the Expense Reports and submits it approval. The approval process goes through Expense Manager 1 and Expense Manager 2 and Pooled Pre-Pay Auditor based on the Approver Assignment page. All the Pre-Pay Auditors have got the approval notifications in the Worklist. But when I logged as one of the Pre-Pay Auditor and tries to approve the transaction, the window is blank with  " no processing" action. The same issue was happening when I try to approve the transaction with the Expense Manager 2. I did the workaround to see if I can Approve the transaction by