Activate windows 10 on new laptop?

I'm desperate right now.
I've been trying to get Windows running since last night.

Yesterday I booted my newly bought laptop without an operating system (FreeDOS) with a stick with Windows 10 and got Windows 10 Pro installed (with product key input). Today I take my laptop with me to my parents, start it and now it says Enable desktop Windows, switch to the settings to activate Windows, as far as I've done and entered the product key again. Now, however, the error message appears that the key is not valid.

I really don't know what to do next, who can help me?

I also tried to activate the key in the cmd with slui 4 as described by the seller, but nothing happens. Was that a 4 euro key from eBay?

what options do I have now? Do I have to buy an "Original" key from the store? It costs over 200 euro for Pro. But I also installed Pro, so I have to delete everything and install the standard Windows version?

Buy a key through MMOGA because I had no problems the pro version costs 14.99 euro

Which version do you have and which version is the key?

I'll do well.

Then the key has been blocked.

Don't buy a cheap key like with mmoga these are only volume keys.

Better at Linzengo.

I installed Win10 Pro 64 and the key is also for Win10 Pro 64 so I don't understand it

Just buy another 4 euro key. But on Rakuten, you get really good ones. I already bought 20+ and always worked.

For 40 euro! I'm not stupid

Otherwise try again the old key but then you go to upgrade and wear the key because a ka whether that helps

? It fits. After that you never need one again and you can be sure that it will not be blocked

They are not blocked on ebay either

Then give it back and request a new one

Never need one again. Well, they won't be banned on Rakuten. Have you tried them before? Or do you trust YTern because they said that and earn money with Lizengo?

Rakuten is good too. Lizengo comes across as serious to me. Have only heard one Youtuber say that lizengo is good. But don't look too much either

Scjau a little on ebay classified ads if you can see the keys on the back of any laptops

Windows 7 pro works too!