It probably said this:
Chat has been turned off
There are regional regulations that affect this account. Chat features have been disabled by default. You can re-enable those features now or enable them later in Options → Social.
If you decide to enable them, please be mindful of our community interaction policies and report any abusive behavior, chat or other conduct intended to undermine or disrupt the game experience using our in-game reporting options; we’ll review chat records and take appropriate action.
Buttons:
[Turn Chat On] [Leave Chat Off]
No idea what regulations it is referring to though.
Here is another thread on it…
Chat has been turned off - Support / Customer Support - World of Warcraft Forums (blizzard.com)