Office connect does not work?

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Hi, I have Office Home & Student 2016. Since my laptop due to problems reset and thought (since I had read the Internet) I could turn the key again because it is the same pc or laptop. But now it does not work… Did I misunderstand something? If not, how can I fix the problem?

Qu

Either after this instruction

https://praxistipps.chip.de/...ehts_51047

Or log off a computer at Microsoft for Office if it is a single user license. Then you can re-register the computer