If the name of your US-based business was updated with the IRS 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. On average, this takes the IRS 3–4 weeks.
If your legal name and tax ID on file match the info on your SS-4 confirmation letter (for the new TINs issued within the last ~3 months) and Stripe is unable to verify it with IRS records, upload a copy of your letter to the Dashboard.