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 recently added TurboTax FAQ for more information: Excess 401(k) Contribution Preventing E-filing.
I was working on it this afternoon and couldn’t, was stuck in a loop even after following the instructions to report excess deferral as you’ve recommended. I saw somewhere else that this issue is to be resolved by 4/5/2019?
I'm sorry, you are correct, I misunderstood the problem you were having. See edited answer above.
Unfortunately, looks like Turbo Tax has given up. Even after updating today, still get the same error. The FAQ above now says to paper-file if excess contribution is withheld.
I know it sucks! Hate paper filing, thanks much TurboTax. I had already paid or else would have gone somewhere else, this is like the simplest of math problems out there!