Entra B2C Audit Logs nearly empty

Question

I'm trying to find logs that will tell me when a user's issued an auth token from our application.

Despite myself and a great number of other users actively using the SSO application, the Audit Logs are completely empty save for a few by myself only over the past 2 hours, despite having logged in myself multiple times over the past 7 days.

https://learn.microsoft.com/en-us/azure/active-directory-b2c/view-audit-logs

I've been following this and it suggests that you would be able to view the logs through Home > Azure AD B2C > Audit Logs.

My app registration allows Accounts in any identity provider or organizational directory to access this app. But it should still be issuing tokens.

Why are the B2C audit logs nearly empty?