You can try the alternative phone activation hotlines[1], they might work. [1] https://support.microsoft.com/en-us/office/-telephone-activation-is-no-longer-su

You can try the alternative phone activation hotlines[1], they might work. [1] 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 https://support.microsoft.com/en-us/office/-telephone-activa...