It's 4/22 & the IRS sent me a letter: efile payment information was incorrect "No Account / Unable to Locate Account". How do I check and verify the info I submitted?

Do you have a tax due?  If the IRS couldn't take it out of your account then you need to pay at <a rel="nofollow" target="_blank" href="https://www.irs.gov/payments">https://www.irs.gov/payments</a>.  Some banks use different routing numbers for deposits and payments.  I think Bank of America does.

look at the TT return and see whats in the bank a/c info boxes.