Red Dead Redemption 2 (DODI Repack) not starting and giving me "Activation Error"

Activation Error = Your Social Club account is not entitled to Red Dead Redemption 2. Please verify your internet connection and restart the game.

The game was running fine but the issue came up suddenly after a Windows Driver Update (I'm on Windows 10). I've tried running the game as an administrator, uninstalling and reinstalling the game but nothing seems to work. My firewall is off. Please help me.