According to FB, this is why this is occurring: "This ad set isn't generating enough leads to exit the learning phase. This usually occurs when your ad set is limited by audience size, cost control, budget or other settings. Consider making changes to your ad set to improve performance."

But just because an ad set is learning limited, doesn’t mean it won’t perform. It just means the algorithm is having a bit of trouble with that ad set and could use some more conversions to give it more data to feed off of.

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