"Product key is not valid" error when activating Office

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MS Office Won't Activate - Microsoft Community. 

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Microsoft Office product key not valid after recovering my laptop - Microsoft Community.

  However, I recently recovered my laptop and would like to re-install my Office However, it says my product key is not valid. What should I do? Buying a product key? · Close all Office apps. · Go to Services & subscriptions and sign in with your Microsoft account. · Under your Microsoft subscription. First, you do have a legal license for Pro Plus. In that case you have to do a phone activation. When you phone in, don't reply to the prompts until they give.