Contact Microsoft Office Support - Microsoft Support
https://support.microsoft.com/en-us/topic/contact-microsoft-office-support-fd6bb40e-75b7-6f43-d6f9-c13d10850e77
WEBSign in to Microsoft 365 admin center with your Microsoft 365 admin account, and select Support > Help and support, enter your question and select Contact support. If you're an admin on the account you can also call (800) 865-9408 (toll-free, US only).
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