Active Bank Accounts with different Display Names

Summary:

I have a request to create an OTBI report which shows the active banks accounts with different Display Names against them, these names are likely to be spouses who work in the organisation and who share the same bank account and have their salaries paid into that account, and I need to create an exception report to flag them.

I've applied the below count in the Person Number field but it not working as envisaged.

COUNT("Worker"."Person Number" BY "Target Bank"."Target Bank Account Number")

The output I need is Bank Account, No of People, Names of People.