Search for users in Microsoft 365 Lighthouse
Microsoft 365 Lighthouse lets you search for a specific user across all active tenants. This allows you to find a user quickly without needing to navigate different tenants.
In the left navigation pane in Lighthouse, select Users > Account management > Search users.
In the search box, enter a display name or user principal name (UPN).
From the search results list, select the user you want to research.
Once the user is found, you can reset their password or block their account. For more information, see Reset user password or Block user sign-in in Microsoft 365 Lighthouse.
Manage Microsoft 365 user accounts (article)
Reset user password (article)
Block user sign-in in Microsoft 365 Lighthouse (article)
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