Failed to authenticate D2 Resurrected

It is possible to install a game client or login to a system that has a game client installed that you do not have a purchased license for. If you attempt to access the game client, it will show an active license on your battle.net account. Active typically refers to not being banned or restricted.

I looked at the battle.net account you are posting from and there are no purchases. If you have purchased the game, it was not done via this battle.net account. I can only recommend checking any other emails you control for battle.net accounts and then checking those accounts for your license purchase order.