Inactive Windows after repair

I took my laptop to the service center — they replaced the disk and installed a “clean” Windows. I brought it back — everything works, but a watermark about activation appeared at the bottom of the screen. Before the repair, the system was official, from the store. The service says that “activation was not included in the services”. How can I activate it again if the key was not saved?

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  • I took my laptop to the service center — they replaced the disk and installed a “clean” Windows. I brought it back — everything works, but a watermark about activation appeared at the bottom of the screen. Before the repair, the system was official, from the store. The service says that “activation was not included in the services”. How can I activate it again if the key was not saved?

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