I have contacted both IRS and TurboTax and eventually got a human. Lady at IRS put me on hold to consult someone and eventually told me to wait 21 days then contact them. TurboTax lady said it showed going to the IRS, I had to wait on them. Like you I would think there should be no choke point in acknowledging receipt , although it may start some clock ticking and I am speculating they may be doing batches to manage their output expectations
