I’m having the same issue, I’ve tried reinstalling, I’ve got no launcher updates and I’ve opened both battle.net and battle.net launcher in admin mode and still no beta appearing anywhere.
I’m based in the UK and it’s set to Europe region.
I’ve dropped down the menu and all it shows is call of duty: modern warfare II.
It shows I have purchased the game, I bought it in July.
The only option at the top says “shop call of duty”
I’ve searched through my emails and have no code to redeem.
It’s really frustrating as I’m away from tomorrow so was hoping to at least get one evening of play time.