Cannot Create Lookalike Audience on Meta: Why It Happens and How to Fix It
Quick fix
Cannot create lookalike audience errors often come from the source. Meta's Marketing API documentation says a custom audience needs at least 100 people, with at least 100 from a country. A source with integrity restrictions can't be used, and lookalikes are limited for some housing, employment and financial ads. Grow or change the source, then retry.
- Check the source custom audience has at least 100 people.
- Check at least 100 of them are in the country you choose.
- Check the campaign is not a housing, employment or financial ad.
- Try a different source if Meta says it has restrictions.
Can't fix it yourself? Send me the details
What this error means
A lookalike audience is built from a source, usually a custom audience, so Meta can find people similar to your existing customers. If the source is too small, has too few people in the chosen country, is restricted, or the campaign type doesn't allow lookalikes, you can't create or use one.
Why it happens
1Source audience too small
Meta's developer documentation says a custom audience needs at least 100 people.
How to tell if this is you: The source audience is new or very narrow.
2Too few people in the chosen country
At least 100 seed members are needed from a country.
How to tell if this is you: Most of your customers are outside the country you picked.
3The source has restrictions
A seed audience with integrity restrictions cannot be used.
How to tell if this is you: The error says "Seed audience restricted".
4Special Ad Category or people under 18
Lookalikes are limited for some financial, employment and housing ads, and for audiences including people under 18.
How to tell if this is you: The campaign declares a Special Ad Category, or targets teens.
How to fix it
Create the lookalike
- Go to Audiences, click
Create audienceand selectLookalike audience. - Choose a source and country.
- Pick a similarity range: smaller percentages match the source more closely.
Fix the source
For: Source audience too small, Too few people in the chosen country, The source has restrictions
- Grow the source to at least 100 people, with at least 100 in the target country.
- Use a different source if the current one is restricted.
- Consider a source of your best customers rather than all customers.
How long it takes
Meta doesn't publish a timeline for this.
How to stop it happening again
- Build sources from your best customers and keep them large enough.
- Plan targeting before declaring a Special Ad Category.
From my desk
With little data, the best source is the strongest real signal the client has, such as purchasers or qualified leads, not page likes or all site visitors. A small list of real customers usually beats a large loose one. If they have a customer list, even a modest one, I would upload that first.
Muhammed Abdul Kalam
When to get help
- You have plenty of customers but the source audiences stay too small to use.
- The source keeps being flagged as restricted and you do not know why.
Stuck on this? Send me the details.Tell me what the platform shows and what you've tried so far.
Send me the detailsFAQs
How many people do I need for a lookalike audience?
Meta's Marketing API documentation says a custom audience needs at least 100 people, and at least 100 seed members from the chosen country.
Can I use lookalikes for housing or job ads?
Lookalike audiences are limited or unavailable for some ads about financial products and services, employment or housing.
What does Seed audience restricted mean?
The source has integrity restrictions, so it cannot be used to create a lookalike. Use a different source.
Which lookalike percentage should I choose?
Smaller percentages match the source more closely; larger ones create a bigger, broader audience. Sets can use 0-1%, 1-3% and 3-6%.
Can I build a lookalike from conversions?
Campaign or ad set conversion lookalikes need at least 100 unique conversions.