Without doing a deep dive into specifications for the IRS modernized e-file format (MEF), I couldn't say whether the lack of support for form 2848 was an IRS issue or a Turbotax issue. There are a number of things that the IRS allows tax professionals (and professional level software) to do, that consumer level software (considered "Self-prepared" by the IRS) is not allowed to do. Certain attachments may be one of those things. And in fact, the odds are in favor of your tax pro having used one of Intuit's professional programs, since they are the market leader in professional software too. Glad you got it sorted out.
