Does Defender for Office P2 allow primary account protection for M365 business premium?
I have business premium and have the trial for P2.
Add priority accounts from the Setup page.
Go to the Microsoft 365 admin center at https://admin.microsoft.com.
Go to Setup > Organizational knowledge, and choose View under Monitor your most important accounts.
but the page
The Priority account protection feature that's described in this topic is available only to organizations that meet the following requirements:
Microsoft Defender for Office 365 Plan 2, including those with Office 365 E3, Office 365 E5, Microsoft 365 E5, or Microsoft 365 E5 Security.