Good morning!
I don’t work for Blizzard so I honestly don’t know yet what can be done if they are not showing up.
The Beta Rewards are bound at the Bnet account level and should be in the vendor tabs where they belong assuming the account is the same one played during Beta.
This is obviously something impacting several people so the most I can do is make sure they know there is a possible bug related to Deluxe, Ultimate, and Beta in-game rewards being granted.