Microsoft 365 Lighthouse is an admin portal that helps Managed Service Providers (MSPs) secure and manage devices, data, and users at scale

 https://docs.microsoft.com/en-us/microsoft-365/lighthouse/m365-lighthouse-overview?view=o365-worldwide

Microsoft 365 Lighthouse is an admin portal that helps Managed Service Providers (MSPs) secure and manage devices, data, and users at scale for small- and medium-sized business (SMB) customers who are using Microsoft 365 Business Premium or Microsoft 365 E3.

Lighthouse simplifies onboarding of Microsoft 365 Business Premium and Microsoft 365 E3 tenants by recommending security configuration baselines tailored to SMB customers and providing multi-tenant views across all customer environments. With Lighthouse, MSPs can scale the management of their customers, focus on what's most important, quickly find and investigate risks, and take action to get their customers to a healthy and secure state.