Microsoft 365 or Office for home. If you have a home product and it came with a product key*, before installing for the first time (or sharing it if you have Microsoft 365 Family), you need to redeem your product key first. Go to office.com/setup and sign in with an existing or new Microsoft account and then enter your product key to redeem it
To our surprise the support said there are no activation history for that product key and said to wait some hours and probably a server issue. now even waiting for a day still it says the product key is already in used.
Under Install information, locate the old Laptop which Office was installed on Select Deactivate Install to deactivate the Office installation Then, click Install to install Office
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