[citation needed] If they’ve made it crystal clear you shouldn’t have a problem giving your source?
Otherwise, all we’ve seen is a single paragraph. Where one sentence talks about opting in to the beta selection processs. And then the following sentence stipulates that an active subscription will be needed to participate. Where participate != getting selected.
In this case, the Developers live and work in California. The test servers are also primarily focused on North America. So the scheduling needed to do a focused stress test for Australia makes it more than a bit prohibitive and/or problematic. The “Stress Test” does actually run for the better part of two days as per their posts, so there are chances to play outside the focus window. It just won’t be at the time they’re seeking to see peak population on the stress test.
It’s right above the blue “Play” button in your launcher under WoW. If you don’t see it, I guess it may be because you only have one account on your WoW side of things, and I assume it’d show up if you had another account(like the stress test) show up. I don’t know if it the menu shows up regardless or not.
I have a friend in the beta whose Battle.net client bugged out. They had to nuke the cache for the client and re-install it, but ultimately got things to work.
Although also in their case, they DID have a selection for an additional account/region, it just had the wrong(cached) information tied to it. The Classic Beta was intially coming up as the BFA Beta instead. (Which is where the cache clearing and re-install fixed things)
I assume if anyone wanted to double check if they’re in the beta/stress test, I’d imagine it’d show up under your https://account.blizzard.com/games (Battle.net games list), unless they’re doing it differently.