Board Thread:Support Requests - Getting Started/@comment-26425680-20151202030843

I'd like to change my account name. After reading the "Change your user name" help page, I followed its instructions to see if my desired username was available.

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↑ This tells me that the name I want, Thomas O., is not in use, but when I enter my new name in the form, a message pops up to tell me it's already taken. So which one is it? Is there any way to claim this name? 