While it is possible this is a bug with the WoWToken system, it is weird that this change is reflected in different places in the game's UI for European players.
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With today's weekly reset for the EU servers, players were surprised to see their ability to exchange WoW Tokens to Battle.net balance supposedly removed. This isn't a change announced by Blizzard, so it may be a bug. This change hasn't affected NA/OCE realms yet.