when attempting to e-file using bank account, I get error message: "Please verify your account number has been entered correctly". I've checked and it is correct.

Banks have a special routing number for ach, etc. You might have to call your bank and ask them for it.   Or you can find it on the bank's website.

Here is how to find the routing number on your checks

https://ttlc.intuit.com/community/refunds/help/which-number-on-my-check-is-the-routing-number/00/26183

Do you have Bank of America?  If you used Bank of America there are five routing numbers that the bank does not use for electronic transactions.  And it depends what state you are in.

It's the same one I've always used.  Right from the bottom of my check.  It's worked just fine in the past, just not this year.

Sometimes you need to type a zero (or a few zeros) at the beginning of the account number.  Check if your account number is shorter than the max size currently used at your bank.