Customer list not appearing in PMax audience signals

In the audience manager, in the "Your data segments" tab, we created a customer list using a CSV with a list of clients that registered in one of our clients' website. The import was successful with a 99% match rate and the list has a size of 1.6k-2.9k users.

When we try to add that customer list to the audience signals of our PMax campaigns, the list doesn't appear in the options and at the bottom of the select box it says "1 customer list related segment can't be shown due to eligibility issues."

Does anyone know what the problem is?

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