Your issue is that your bungeecord jar is likely outdated. The latest jar supports 1.8-1.12 and that's what you're looking for. Bungee doesn't support protocol 1.17.10 at this point in time anymore.
In the section of the document where you describe the procedure of the deal, the last part worries me. Are you saying you're selling the name, builds , graphics, domain but deleting the server from the dedicated server?
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