Before Lightning AI runs automatic expansion, the computer checks to make sure there is enough budget to create at least 1 ad set.
If you spent your entire budget yesterday (or spent more than your budget), Lightning AI will not create any ad sets.
If you did not spend your full budget yesterday, and there is enough room in the budget to spend more on testing new audiences, Lightning AI will create at least one new ad set.
If you would like automatic expansion to run every single day, we recommend setting a high budget for the campaign on automatic expansion and setting a lower budget for spend optimization. You will spend more than the lower budget, but not more than the high budget. For example, if your "high" budget is $250 and your "low" budget is $100, then you will spend between $100 and $250 per day.
Looking for more information? Reach out to us for help!