"The issue we encountered for the 30 minutes that Battlegrounds were open was thornier than it originally looked. Before we reopen BGs, we’re going to need to do some cleanup that can only be done with realm restarts. We’ll perform those restarts tomorrow, and the timing of them should now be posted in your Breaking News.
Regarding the SoD version of Chronoboons that were briefly available in Alterac Valley, please be advised that these will be rendered functionless on Anniversary realms. They can be ignored.
Chronoboons that are native to Anniversary realms will not be affected.
We apologize for the delay in getting Battlegrounds working properly for everyone, and we appreciate your patience and understanding.
"
From the thread on this forum named " Anniversary Realms Battleground Update"
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