Despite the June 3, 2019 date*, on the original post, that answer only apples to 2017 and earlier returns.
All miscellaneous itemized deduction, subject to the 2% of your Adjusted Gross Income limit, were eliminated starting in 2018.
Losses in a 529 plan are not deductible, at all.
*The date is when old answers were transferred to the new discussion forum.
