Microsoft Tenant Checker Tenant Name or Domain .onmicrosoft.com Region Worldwide ▼ Worldwide US Government China Check Availability Enter a tenant name to check if it's available, or enter a domain to check if it's connected to Microsoft 365. Only letters and numbers are allowed for tenant names. 💡 Not sure what a tenant name is? Check Results Tenant Information ⚠️ Try Again Recent Searches No recent searches