I have filled in all of my boxes correctly, but my NETFILE isn't working. What are some possible reasons that NETFILE doesn't work?

[TurboTaxSusan]

Here are some possible reasons why the CRA may not have received your tax return: https://turbotax.community.intuit.ca/replies/2648037

Here is an FAQ that talks about NETFILE eligibility: https://turbotax.community.intuit.ca/replies/2647669
If you still feel that you are eligible, please go through the My Info part of the review again and make sure all the questions are answered, and that they are answered correctly. Ex: On the Contact Info page, make sure you have answered NO to the question “Is your mailing address outside Canada?”.
Also, if you didn’t do so before, go through the Review before using NETFILE.

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/replies/3456106