According to the TurboTax FAQ below, regarding your extension request: "In the unlikely event of a rejection, you have until April 20, 2019 to either re-submit or mail your extension request."
https://ttlc.intuit.com/replies/3301328
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
