I did get an invitation to become the owner of a billed-enabled application from a regular google account (I have a google apps account).
I've tried both invite links and both gives the "You are not authorized to access this application." error that some others did get.
The funny thing is that previously I did get an invite to become a developer and it was working. But becoming the owner failed. Is it due to the fact that I have a google apps account and the invite comes from a non google apps account?
Thanks in advance
This is usually because when you click on the link you are already logged in using some other Google account that is not invited. If you are using Chrome, try copying and pasting the link into an Incognito window.