Once your authentication method to an OpenAI account has been set, it cannot be changed. If you’ve chosen Google as your third-party authentication service, then it is your Google password you’ll have to rotate and which gives access to the service and management.
This information gives you such denial, but also follows up with information to confuse.
https://help.openai.com/en/articles/4936824-can-i-change-my-authentication-method