To protect Canadians from the outbreak of COVID-19, the Prime Minister announced travel restrictions that limit travel to Canada. Until further notice, most foreign nationals cannot travel to Canada, even if they have a valid visitor visa or electronic travel authorization (eTA).

These restrictions stop most non-essential (discretionary) travel to Canada.

Reference cic website

https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19/travel-restrictions-exemptions.html