I'm trying to apply Audience targeting to my navigation links in SharePoint online. Last week I created several audiences in the Admin Center, and they have compiled successfully. However, when I turn on Audience Targeting, and try to add the newly compiled audiences, they aren't available.
If you are using classic audiences and you want to make use in modern sites, they are not going to be available there. Audiences in modern SPO sites does not rely on classic audiences, they rely on Microsoft 365 Groups