The IRS E-file Servers have not yet been updated for Tax due payment dates up until 5/17/21. TurboTax's product team expects to hear when The IRS will have their e-file servers updated on Monday, March 22, 2021. At that point, changes to TurboTax can be made.
We are still waiting on some changes to be made to allow the 5/17 payment date to be accepted via e-file. You can Sign up here for updates.
Please see this for more information: Why am I unable to choose payment dates after 4/15/2021 for taxes due
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