A new wave of invites went out earlier today, do not forget to check if you’ve been invited!
You do not need to be subscribed to the game or have Dragonflight pre-ordered to get invited.
Mails are usually delayed and the fastest way to find out if you’ve been invited to the testing is by opening the Battle.net app dropdown and checking if you have Dragonflight Beta under the In Development tab.
If you haven’t been invited to the testing, make sure to opt-in for Dragonflight Beta.