@JFenzau
Maybe it's something else related to your Schedule C. Did you take a self-employed health insurance deduction, for instance? If so, that Form 7206 is not yet available.
But your issue may be part of a wider problem. I just found another thread where several people are reporting they are unable to efile with Schedule C:
https://ttlc.intuit.com/community/business-taxes/discussion/can-t-e-file-schedule-c/00/3134801
If you want to phone TurboTax customer support, here's how:
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
