A lot of people think that only the unvaccinated are likely to get covid however people still unknowingly carry the virus whether they are vaccinated or not.
The Canadian Province of Ontario is over 75% fully vaccinated and they are having a high resurgence of covid cases. According to this recent report from Global News: https://www.google.com/amp/s/globalnews.ca/news/8465326/ontario-covid-cases-december-21-coronavirus/amp/
On December 21, 2021, 3,453 new cases were recorded, the data showed 673 were unvaccinated people, 132 were partially vaccinated people, 2,500 were fully vaccinated people and for 148 people the vaccination status was unknown. So cases in the fully vaccinated are actually higher than the unvaccinated.