Here are the most common reasons for failing Tax ID verification:
The U.S. Tax ID Number (TIN) was entered incorrectly.
The legal entity name on your account must exactly match U.S. Internal Revenue Service (IRS) records, including spaces and punctuation. If you are using an EIN, make sure that your legal entity name matches the one on the letter the IRS sent you when you signed up for your EIN.
Your Tax ID isn’t included in the IRS database yet.
It can take a few weeks for the IRS to add your Tax ID to their records.