Site Funnels dashboard doesn't have any data for "Begin Checkout"

We’re analyzing our Site Funnels dashboard, and all of the other metrics look good except for “Begin Checkout”, which is zero. Why would this be happening?

This metric is based on the volume of begin_checkout events that you’re tracking in GA4. Can you please first confirm in your GA4 reporting interface that you have a significant number of begin_checkout events during the same time period you’re reporting on in Looker?