We've been notified some users are having trouble unlocking their Edge Totally Awesome Pre-order bonus once they're in-game. This is an issue we're looking into, and we've also got a workaround you can try out in the meantime!
Once you're at the WWE 2K Battlegrounds main menu, press in the right-stick to "check for updates" and this can unlock the pre-order bonus.
While we continue looking into the issue, please give this workaround a shot! We'll post updates on progress as they come in.