In a similar position. TurboTax does not support sending of Form 2350 through e-file
https://ttlc.intuit.com/community/taxes/discussion/can-i-fill-form-2350-out-from-turbo-tax/00/4561
and the IRS does not let you email the form to them (that would be too easy and sensible) so you are left with filling in the PDF form and physically mailing it to the IRS. You have to complete a Return Label with your address for them to confirm their decision (by mail).
