Supplier Match for duplicate Taxpayer ID during Supplier Registration

Summary:

We are testing supplier match during supplier registration and have addressed all the setups required for supplier match. The score threshold is also set at 10%, match config is enabled and keys rebuilt. Supplier relationship has also been defined in the config.

For a supplier registering with a name similar to an existing supplier, the system is generating a supplier match. However, for supplier with different name but duplicate/ existing Taxpayer ID, the system is not generating any supplier matches. Similarly, no matches are being shown on registration request for same address (line 1 and Postal Code).

Has anyone faced this too? If so, is the a way to resolve this?