[Facebook Ads] Campaign keeps showing "Phase not completed" — Causes & Solutions

Hello everyone in the BHW community!
Recently, when deploying Facebook Ads campaigns, I encountered a fairly common situation: campaigns kept getting stuck in "Incomplete stage" status or not being delivered despite being approved.
Specific scenarios:
Ads approved
Account clean, payment method stable
But campaign not delivered or stuck in learning mode > 48h
Some cases report "Not delivered", "Limited learning", but the reason is unclear
Some reasons I noted:
-The audience is too narrow (less than 1,000 people)
-The number of conversions is not enough for the algorithm to learn (less than 50 conversions/ad set/week)
-The budget is too low compared to the goal
-There are many changes in the ad set or creative, causing the system to constantly reset the learning process
-The pixel does not have enough data or is not firing properly
How I solved it (and it worked in some cases):
- Increase budget slightly or switch to CPM/manual bidding if you need to control delivery
- Expand audience, limit over-targeting
- Keep campaign stable for at least 48 hours, avoid multiple edits
- Optimize creative to increase initial engagement, support algorithm with data
- Re-verify/properly verify domain, ensure events are recorded
I suspect many of you here have encountered or dealt with similar issues. If you have any other tips or insights on how Facebook's machine learning algorithms work, I'd love to hear from you!

Do you use payoneer card? We often use this type of card and often encounter the situation of not spending the account

You should look for accounts with credit limits to spend, all ads will be approved quickly.

Great breakdown!
We also notice stuck campaigns when scaling too fast or using low-trust pages.
To fix: warm up slowly, avoid big edits, and use verified assets.

Facebook’s delivery issues usually come down to the algorithm never finding enough usable data to optimize, so your fixes all make sense. A few other things you might try:

First, switch your campaign to CBO (Campaign Budget Optimization) so the system can shift spend to the best-performing ad sets instead of starving them. If you’re optimizing for conversions but don’t yet hit 50 conversions/week per ad set, try running a short “traffic” or “link clicks” phase first to build baseline data, then flip to “conversions” once your pixel has volume.

Second, lean on Advantage+ placements rather than manually chopping up spots. Letting Facebook choose where to show your ads often surfaces pockets of scale you wouldn’t hit with just Feed or Stories.

Third, watch your frequency—if you’re over 2–3 views per person in the first few days, pull back. High frequency can stall learning because people simply stop reacting.

Finally, check your attribution window. A 7-day click + 1-day view window gives the algorithm more events to learn from than the default 1-day click only. It won’t change your actual reporting much, but it will smooth out delivery and kick your ad sets out of learning sooner.