Comment 1 for bug 389709

Okay, that specific error message you mentioned was improved per bug #386242, it now says:

{{{
Launchpad failed to process the upload path '~boing/ppa':

Could not find person or team named 'boing'

It is likely that you have a configuration problem with dput/dupload.
Please check the documentation at https://help.launchpad.net/Packaging/PPA#Uploading and update your configuration.
}}}

So, PPAs can be related with a Launchpad person or team, it's not necessarily about your login name.

That said, the second part of the bug is legitimate, it'd be better indeed if the rejection warning was presented synchronous and caused dput to fail.

This bug is part of a set of bugs that urge for a better upload server-side, like bug #136593 and others.