Tried updating mine as well.
Tells me that "The provided clan name or clan tag is not acceptable, please choose another."
WTF!!!!
English
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Yeah, same thing, they actually changed our clan name to a bunch of numbers because apparently our previous name was inappropriate, and has said to change our motto, name, and about us. I'm an admin - but can't make changes to any of these fields. In fact, can't even see how to change the clan name.