IRS "E Services" is the only resource actually capable of verifying a name/TIN combination and suggesting what the problem might be with a mismatch. See Publication 2108
"E Services" was designed for information reporting, not CIP, so remember:
1) It can only be queried after
an account is established and
2) the account must be one that is subject to information reporting; e.g. 1099 INT, etc.