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If you're an admin on the account, submit a service request. Sign in to Microsoft 365 with your Microsoft 365 user ID, and click Support > New service request. If you're in the new admin center, click Show all > Support > New service request.
If you're an admin on the account, call (800) 865-9408 (toll-free, US only). If you’re outside the United States, see the global support phone numbers.