Challenges can only be initiated if both players are in the same region.

Information about cross-faction communication in World of Warcraft

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Why you may not be able to turn experience gain off for a character.

What to do if the Medivh Guardian Pack transmog isn't showing ingame

Your Classic stats do not contribute to unlocking Warcraft III: Reforged achievement rewards.

What to do if you're unable to complete this quest

What to do if you didn't receive your WoW's Anniversary Gift on a new character

Unable to transfer character due to invisible mail.

What to try if you cannot complete the quest Harnessing the Power.