I've been wanting to change the Bungie name for a long time, but I get the same error every time when I want to change it.
[b]Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node.[/b]
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try the app or a different browser
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Background maintenance has started on Bungie.net and D2, you could try another browser/device but you will probably want to wait until after maintenance in case any issues happen