Check review and account status, schedules, time zones, locations, audience size, bid restrictions and goal events. Distinguish a delivery problem from visits that have not yet produced enough results.
Fix settings and events affecting delivery, then check whether the budget is spread across too many test groups. Focus on the primary goal instead of repeatedly duplicating, pausing and restarting campaigns without a diagnosis.
Record when delivery, spending and results begin or recover. Use learning status, sample size and the business cycle to decide whether to observe or adjust; early fluctuations alone do not establish failure.
