how to re-activate office 2021 by phone

Zoe Hung 20 Reputation points
2026-07-19T14:09:20.05+00:00

My computer motherboard was out of order. Office 2021 have to reactivate after replacing motherboard.

I tried to activate over internet. but no luck. The error message is "the key have reached the maximum number of activation. I want to activate by phone. But the activation telephone number in Hong Kong 852-23889600, 852-29042198 are no longer valid.

Please advise the solution to activate office 2021 again

Best Regards

Zoe Hung

Microsoft 365 and Office | Install, redeem, activate | Other | Other
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Answer accepted by question author
Norah-L 10,740 Reputation points Microsoft External Staff Moderator
2026-07-20T01:58:58.8466667+00:00

Hello Zoe Hung,

I understand that your computer’s motherboard was replaced, and Office 2021 now shows that the product key has reached its maximum number of activations.

Please try calling the current Hong Kong Product Activation Center at +852 3002 2858 to see whether it works. Keep the Office Activation Wizard open, as you will need to provide the Installation ID shown on the screen and then enter the Confirmation ID you receive.

User's image

Reference: Telephone activation is no longer supported for your product" error when activating Office

If the call does not connect or the activation is refused, please contact Microsoft Supportfor further assistance. Since this is a user-to-user community forum, we can only share suggestions based on our findings and personal experiences, but we cannot verify the license or reset the activation limit.

When go to support page, enter a short description such as “Office 2021 activation limit after motherboard replacement” select Get Help, then scroll down and select Sign in to contact support (please sign in using a personal Microsoft account). After that, follow the on-screen prompts to reach Support Team. It is recommended to have your product key, proof of purchase, and any motherboard repair documents ready so the support agent can verify the license and advise whether it can be reactivated.

Tip: Support chat availability may vary by country/region, product, and support hours. If you can't get in touch with a chat agent right away, trying again later or at a different time may help.

I hope everything goes smoothly. Thank you so much for your patience!

Best regards.

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  1. Zoe Hung 20 Reputation points
    2026-07-20T03:40:32.99+00:00

    Accepted. Follow the instructions of the hotline and go to Activation Portal

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  2. Zoe Hung 20 Reputation points
    2026-07-20T16:32:21.2566667+00:00

    Accepted. Noah, thanks a lot for your help.

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