If you are a user with Editor permissions for the GA4 property, you can create Audiences.
(* Please note that the number of Audiences is limited to a maximum of 400, so we would appreciate it if you could avoid creating them indiscriminately.)
[GA4]Create, Edit, and Archive Audiences - Analytics Help Center (google.com)
❗ However, if you wish to set Key Events through Audience Trigger Events, you cannot create them arbitrarily.
Please create the Audience, but do not work directly on the areas marked in the image below. The Data Insights team will handle the settings, so please make sure to request the settings through the D2C Help Center.
When Audience Trigger Events are arbitrarily configured, events that were not originally planned can be collected immediately upon condition fulfillment. This can lead to difficulties in maintaining consistent event naming and managing events effectively.
Please note that if you arbitrarily create Audience Trigger Events or set Key Events, there may be disadvantages such as the revocation of permissions.