An advertiser attempts to enable target cost-per-acquisition (CPA) bidding but the option isn't available. The most likely reason is that the advertiser:

An advertiser attempts to enable target cost-per-acquisition (CPA) bidding but the option isn't available. The most likely reason is that the advertiser:

Answer

•  has fewer than 15 conversions in the last 30 days.
•  is using Google Analytics.
•  has fewer than five conversions in the last 15 days.
•  is using another automated bid strategy.