I work for a company that is using your external yahoo login and we have a situation as follows.
In the past one of the developers here created this project for the external login and in the meanwhile he left and now we do not have access anymore to this project.
Is it possible to change the admin of a project? Or what other solution do we have?
We do not have a way to change admin of a project.
So you will have to create a new consumer key/secret pair with the same scopes as the previous one, and use them in your code. However, note that access token created with old consumer key will be invalid. So your end users will have to authorize your application again. Effectively, this is like a new project.
Is there any specific information that you need from the old project ?