when entering summary totals code M must be used. you'll also need to complete form 8453 and check the box 8949. you should then be able to e-file your return
you must follow the 8453 instructions for mailing it with the 1099-B attached.
https://www.irs.gov/pub/irs-pdf/f8453.pdf
me thinks the Turbotax warning really refers to the 8453 and 1099-B mailing.
hopefully, by stock sections you mean types A,B,C, D, E,F and X.
