I am able to print my return for mailing and not netfile, why am I unable to netfile my return? How can I correct the situation? I am using Turbo Tax Premier.

Please double check that you are eligible for NETFILE. First time filers, non residents, people with an address that is outside of Canada, etc... are some of the people who can't  NETFILE and must print and mail their returns: https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/netfile-overview/...