oAuth problem - 'app', must be one of 'sales', 'projects'

I have a private app and oAuth setup. It works well for all of our clients except one.

When the client connects and gets redirected back to the site, exception is thrown saying:

Invalid value ‘partnership’ for ‘app’, must be one of ‘sales’, ‘projects’, ‘campaigns’, ‘global’, ‘account_settings’

Not sure where is this ‘partnership’ coming from and what it means.

If someone can explain to me how to overcome this issue, it would be great.