It is common that you will need to test an insert for which you do not fit into the defined audience.
In these cases, you can use the Test On Device feature. You can access this feature on the insert's Review page or on the insert's Dashboard. This test disregards the audience, so you can test the insert even if you do not fit into its audience.
Also, when in paired mode (when you see the small Insert icon in your app), you will see all inserts associated with your app regardless of audience fit.
When an app is in Test On Device mode, a small eye icon appears as shown below.
The dialog in the Insert Console updates to indicate the app is in test mode.