Remarketing audience in Analytics shows 965 users in the past 7 days, but 0 eligible audience size
When I define a new custom audience (my first one) to make available as a remarketing list in my connected AdWords account, I see that my parameters show 965 active users that match these conditions within the past 7 days. When I save the audience, the text at the bottom of the audience summary reads:
Display audience size: 0
Search audience size: 0
Additionally, when I select this audience as the audience for a remarketing campaign in AdWords, it says there are "too few people on your remarketing list."