As a non-resident, you will not be able to Netfile your return.
I see where you referenced on the CRA website, but it states clearly that if you are a non-resident you will not be able to Netfile.
You will have to print and mail your tax return to the CRA.
In a previous post, I had provided you with the information requested as to how to apply your NR4 - if one is needed at all.
Please take note that if you are overriding in the TurboTax software, this alone may/will prevent you from Netfiling.
Plus, Netfile opens February 24th,2020, no one is able to Netfile until then.
