Hi.. I have been in Canada with WP from Jan 2019 and my work permit expires on 01-Jan-2021. My family (wife and kid) came to Canada in May 2019 . My wife got Open WP and then SIN and filed zero tax for 2019. After I completed my 18 months (Jan 2019 to July 2020), my wife applied for CCB in Oct 2020 (considering that 18 months completed for me and i have a valid WP on 19th month - Aug 2020). but i got a reply from CRA stating that we don't meet residency status.
I'm not sure what went wrong with residency status.