Hi,

The v200909 version of the API uses the ClientLogin API to handle
authentication and authorization:

  http://code.google.com/apis/accounts/docs/AuthForInstalledApps.html

Some AdWords accounts use an older form of login emails that are not
supported by the ClientLogin API.  All new accounts use Google
Accounts for login, which work with the ClientLogin API.  Your
accounts may already have Google Account login emails and if so you
need to use these values when accessing the ClientLogin API.

Best,
- Eric Koleda, AdWords API Team

On Apr 9, 8:12 pm, Zweitze <zwei...@gmail.com> wrote:
> Hello,
>
> I log into accounts using direct logins - no MCC involved. When
> converting to v200909 I noticed that two accounts were actually
> refused by the authentication service. However, when using the old
> method of v13 they still work.
>
> Looking further I noticed that they were refused by the call
> Authtoken.GetToken(). The response is "Login failed" with error code
> CaptchaRequired, the other account has error code BadAuthentication.
>
> Note: I cannot log into the Adwords web interface with these email/
> password combinations either. Again, these email/password combinations
> do work in v13.
>
> How do I proceed? I have no RequestId because the Authtoken class does
> not reveal such info, if that exists at all. I hesitate to post the
> email addresses of these accounts.
>
> Thanks in advance.

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Have you migrated to v200909 yet?
The v13 sunset is on April 22, 2010.

Also find us on our blog and discussion group:
http://adwordsapi.blogspot.com
http://groups.google.com/group/adwords-api
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