It gets sent but they wont process it for multiple months, its a much better option to EF without it, and let them create an online IRS account and apply for the agreement once the return has posted to their IRS Account (once they get a bill, then they know its posted to their account and an agreement can be applied for).

If youre sure you want to send it, be careful with any balance due amounts, I saw a report of someone that they pulled the entire balance due instead of just a small payment they were expecting.