I am experiencing the same problem and have followed all instructions.
The last information I received from TurboTax rep was that the EF version update scheduled for 3/31 was not ready yet but would be ready on/by 4/4. If not then we may file paper state return and do whatever is necessary to get a refund for the state filing.
This is the 2nd year in a row that we have experienced problems submitting returns due to updates not being available according to schedule.