Audit log search

Hi there

I am the Office 365 admin user and have signed up for the free 60 day trial for Power BI Pro. I was hoping that this free trial would enable me to have access to the audit logs. But currently under my admin portal I only have "Usage Metrics", "Manage Users" and "Tenant Settings". Under "Tenant Settings" I also do not have a "Create audit logs for internal activity auditing and compliance purposes" option.

Can someone please help me because I need to be able to see when users outside my organisation view one of the dashboards I shared with them.

Thanks