Hi @Nikoloz Saldadze ,
as far as I know 0x80070490
error referring to "no product key".
You can try a product key from here to finish the installation process: Generic Volume License Keys
On the other hand: If you bought the Windows Server 2019 license you should be provided with the related product key from the seller.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten