@TurboTaxAniqua Already did this for myself and spouse. I did the move to box 53 before I did my first Netfile. My spouse’s went through OK. I spoke to a specialist and she asked me to round the Box 21/53 entries - Netfile still failed for me and was witnessed by the two agents on my call, unfortunately used up 2 of my allocated 5 attempts. As you can see from the various discussions the error occurs because I had a negative capital gain. I just spoke to a CRA agent and he said that both lines 68140 and 68150 should be filled. And if you look at the explanation in error 95365. It says that even if your T3 slips have a net capital gain of zero the software should enter 1 in this field similarly for field 68150. So unless you have no capital gains at all reported in a T3, these fields should never be zero.
