Thanks, @kitesRmything. I'll share your post with TurboTax Moderators to see if they have any explanation as to why you can't use direct debit. Sorry for the difficulty!
*** 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.***
