I had pretty much the same issue. Here is the answer I received:
TurboTax is aware of the e-filing issue that you are having and
is currently working on a solution. An update to fix the issue is expected
to be released
around 4/5/2019.
Be sure to sign up for updates to be alerted as
soon as there is a solution. If you do not want to wait for an update,
you have the option to paper file your tax returns as this is only an
e-filing issue.
You
can check out this TurboTax FAQ for more information: Excess 401(k) Contribution Preventing E-filing
