You must submit a TIN/Name combination. If you leave either the TIN or name blank, the system will consider it invalid (Indicator 4). Due to privacy issues, IRS will not divulge an entity’s name or TIN.
If you submit the same TIN with various names, or, the same name with various TINs, after four attempts, the system will automatically suspend your access to TIN Matching for 96 hours. This was done to prevent “phishing”.
For additional information see Publication 2108a, Online TIN Matching Program.