An App ID with Identifier is not available. Please enter a different string
<p>I've just enrolled in the Apple dev program, but when trying to create an APP ID in the Member center, I receive this message:</p>

<blockquote>
  <p>An App ID with Identifier is not available. Please enter a different
  string.</p>
</blockquote>

<p>Before enrolling, I was using the same account (but not part of the developer program), and building my app for my own phone.</p>

<p>I'm 200% sure this bundle ID is not taken by anyone else but me.</p>

<p>How is that possible in such case? Can XCode register an APP ID by itself ?
I also notice an app id called "XC Wildcard" which is defined for any id "*"</p>

<p>I'm really kind of lost, so any help would be really apreciated.
Thanks!</p>