The usual failure
Klaviyo is 'connected'. Viewed Product never fires. Cart events are a rumour. Flows look live and do nothing.
What to make true
Prove the events. Test as a stranger. If the site does not tell Klaviyo the truth, every flow is cosplay.
Worked example
Keep it this plain. A team uses on-site tracking as if buying the software installed the meaning. It did not. Klaviyo is 'connected'. Viewed Product never fires. Cart events are a rumour. Flows look live and do nothing. The move is not a new integration. Prove the events. Test as a stranger. If the site does not tell Klaviyo the truth, every flow is cosplay.