I had a Google Plus business page where and I changed the ownership of the account to a new manager.
The Google Plus page had an associated email account that could be logged into just like any other Gmail account.
However, after the Google Plus page ownership was transferred, the password for Gmail account owned by the Google Plus page no longer applies. It says the password was recently changed. There was a link that says "Didn't change your password?", and I clicked through to that, and ended up on a message that says:
Please contact your account owner to reset your password or retrieve your username.
The new account owner is my personal Google account, but even though I can go to the Google Plus page and confirm that I am the owner, I can't see any options for changing the password on the Google plus business page.
How do I regain access to the Google Plus business page's Gmail interface now that the owner has changed?