Some lenders maintain preferred institution or programme lists for particular products, pricing or collateral rules. A course being absent from one list does not by itself prove it is unrecognised, and a recognised course does not guarantee financing. Separate academic recognition from lender credit policy.
If the lender cannot explain the rejection beyond a generic code, ask whether the application can be manually reviewed with institution and programme evidence. If policy is fixed, move to a lender whose education-loan product covers your situation rather than creating multiple blind enquiries.