What is a common reason to reject the request if bank raised a request for certification? (Non-cluster request)

What is a common reason to reject the request if bank raised a request for certification? (Non-cluster request)

One of the common reason for rejection is submission of incorrect Bank Public IP in Cflow
For example, the following ranges are incorrect: 192.168 or 10.1 or 10.0 or 10.255.