Customer Bank Account exists in employee record

Summary:

We are trying to add a bank account to a customer but receive an error 'A record with this combination of values already exists'

Content (required):

We are trying to add a bank account to a customer but receive an error 'A record with this combination of values already exists'

Bank account does not exist in AR but is attached to an ex-employee record

What is the process for sharing an account that is already set up against an employee?

Version (include the version you are using, if applicable):

22C

Code Snippet (add any code snippets that support your topic, if applicable):