If your Facebook Ads aren’t using all available placements—even though Advantage+ (auto) placements is selected—it usually means the algorithm is making delivery decisions based on performance potential, creative compatibility, or technical constraints.
Here's why this happens:
1. Meta Optimizes for Performance, Not Equal Distribution
Even with auto placements on, Meta doesn’t guarantee your ad will show across all placements. Instead, it prioritizes the ones most likely to drive results based on your objective, bidding strategy, and audience behavior.
For example, if Reels or Audience Network placements aren’t converting or have high CPAs, Meta will allocate less or no budget there—even if technically available.
2. Creative Format Compatibility Issues
Some placements have strict format requirements. If your ad doesn’t fit:
…Meta may skip those placements altogether to preserve performance and user experience.
3. Budget and Audience Size Limitations
If your audience is small or your budget is low, Meta may limit placements to the ones with the highest efficiency to avoid spreading delivery too thin.
4. Platform or Device Targeting Conflicts
If you’ve set manual controls elsewhere—like limiting delivery to mobile or excluding Instagram via audience segmentation—it can indirectly affect placements even with auto on.
What You Can Do:
Review breakdowns by placement in Ads Manager to confirm where delivery is happening.
Adjust your creative to fit more placements (e.g., upload vertical videos for Stories/Reels).
Increase budget or audience size slightly if delivery is too constrained.
Auto placements optimize for results, not visibility across all options. If you want more control, switch to manual placements—but expect to manage delivery and costs more closely.