Efile program is starting on February 22 2023
What's new The EFILE and ReFILE services are now closed for the electronic filing of your client's initial and amended T1 personal income tax and benefit return. The EFILE and ReFILE services will re-open on Monday, February 20, 2023, at 8:30 a.m. (Eastern Time)
EFILE news and program updates
Reference: https://www.canada.ca/en/revenue-agency/services/e-services/e-services-businesses/efile-electronic-filers/efile-news-program-updates.html