Underneath your question it says you are using the online Live Basic product. Is that incorrect? Are you actually using desktop software (CD/download)? I suspect you may be using the latter.
This state efile roadblock is a known issue for some desktop TurboTax users that is expected to be resolved in a product update on March 19, 2021.
If that's your situation, you can sign up through this FAQ for notifications, if desired.
https://ttlc.intuit.com/community/tax-topics/help/why-am-i-not-able-to-e-file-my-state-return-after-...
