Yes, but I believe they were concerned of a potential bug for accounts with a start date of November 23, 2004. I can’t rule that out 100% because of my confounding variables, but it may help the OP.
OP, I’ve done some digging.
If you have 8 WoW accounts on your Blizzard account, including PTR accounts, or you have two PTR accounts, you may have issues receiving a beta invite.