phone support for activation of office

Which version of Office are you trying to activate? For older versions (which may generate errors on phone activation), see https://support.microsoft.com/en-us/office/-telephone-activation-is-no-longer-supported-for-your-product-error-when-activating-office-9b016cd2-0811-4cb3-b896-5a6a13177713 .

For phone support to complete the activation of your Office product, you can contact the Microsoft Activation Center. If you are in the United States, you can dial 888-725-1047. If you are located outside the United States, you can find the appropriate phone number by typing c:\windows\system32\slui.exe 4 at a command prompt and selecting your country/region to get the phone number.

References:

• Get support for Microsoft 365 for business
• Activate Office 2010 KMS host through phone activation
• MAK activation: known issues
• Contact volume licensing support