I use ATX to efile estimated tax payments (Federal, State, and Local). Recently, I'm getting lots of notices, this is an example from IRS: "You made a payment of $xxx on March 15, 2019, and we can't determine the correct form or tax year to apply it to." State and Local tax departments sometimes send similar notices, sometimes they just issue a refund check.
Has anyone came across similar situations? It's hard to make clients to pay for estimated taxes themselves (whether electronically or with payment vouchers). So I'm relying heavily on ATX...