Newly-issued US tax ID number (TIN) not verifying

If the name of your US-based business was recently updated with the IRS (e.g. within the last 3 months), or if you are a new business registering for the first time, the IRS might not have updated their database with your new details yet. This can take the IRS 3-4 weeks on average.

In the meantime, contact Stripe Support with your SS-4 confirmation letter (for new TINs issued within the last ~3 months) for further assistance. You can also send your Letter 147C instead.