SOLVED - SOLVED --- I had the same issue, spoke to agent Fahida, Toronto, she SOLVED THE PROBLEM. She is going to post in this forum. Basically, the problem is with the T2125 and the T1 General. Make sure your name address etc. is all filled out exactly on these forms (it was just these 2 forms).
There is a glitch in the software (HEY TURBOTAX DEVELOPPERS THIS IS AN OFFICIAL BUG REPORT) that has NOT been solved since 2019 based on the first agent I spoke to. I was told first to start over the return, and i have 160 tax slips so uh-uh... A fluke I called back 2 hours later (8:45 pm May 1st, 3 hours before deadline) and got Fahida, who had someone with the same problem a week ago (my lucky day i guess).
The way I understand it is if there`s missing personal info (name address postal code city etc) on your t2125 or a mismatch with the T1 general, the software thinks you have rental income and generates a T779. THIS IS A BUG!!! You like me, try clearing the info on the form and closing unused forms a dozen times and it won`t work UNTIL you correct the name address postal code etc so it matches on T1 and T2125.
I walked through that with her. And then I closed all unused forms, the T779 did not come back and I was able to NETFILE. I`m taking 3 stars off TurboTax for this, that nearly caused me to have to print out returns after deadline and pay penalties and interest or at the very least spend half a day printing and mailing.
