This issue have been posted about earlier. If I remember correctly it
is an issue with the dots in your username. When checking for
availability it will only check for perfect matches, that is, no other
app or Google user with that id. The problem is with Gmail who
reserves ids which are very similar (registering iden.tity on Gmail
will reserve identity, 1dentity, iden.t1ty, etc). In your case, your
Gmail username would be "user.name" and thus "username" will be
reserved for you aswell.
Sadly, this reservation will block everyone (including yourself) from
using that identifier for an App Engine application.
On 13 Dec, 06:31, Will Merydith wrote:
> I went to create an Application with my Google username
> (usern...@gmail.com).
>
> It says the name is available, but then when I click to submit I get
> the message:
> Already Exists
> This application ID or version is already in use.
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