Secondary e-mail account locked out (again)

Thank you! Found this a couple of days ago, but didn't quite follow it. However after a long (& unsuccessful) phone session with an agent today, I recognised that this step was what she was trying to guide us through:

• Continue the flow and a new secure password will be generated, and the mailbox unlocked

By combining your instructions with a workaround from another user, I was able to restore my husband's access to his secondary mailbox. (He's the account holder, but I do the techie stuff!).