Check the printout or PDF of your return; look for the state cover sheet with the Turbotax logo. If you owed tax, it will show the payment information and how/when you decided to pay. Read the state payment instructions carefully since most states cannot be paid from within the TT system and requires additional steps.
https://ttlc.intuit.com/questions/1900884-what-are-my-options-for-getting-my-state-refund-or-for-pay...
Sadly the first payment you made using the estimated form was applied to 2019 .... you may get them to release it for the 2018 tax year ... call the number on the notice you got an see if it can be done.
