Payment status "Pending action to address acknowledgment failure", what does it means?

Summary:

Hello, we are testing disbursement acknowledgement functionality. And the payment status is stuck at "Pending action to address acknowledgment failure". I need guidance on below points:

1. How can we verify if the ack files are received from the bank and have been picked up by the retrieve acknowledgment process?
2. Which lines in the output file, can help confirm the level of acknowledgment sent by bank?
3. Status "Pending action to address acknowledgment failure", what does this mean?
4. What are the expected status of a payment run if disbursement acknowledgment setups are in place? Please share the list and its meaning.