Hi JonpriL, 

Thanks for your reply.

Please the password concerned is not an Admin one but a standard user.

This is the issue;

She registered for a trial on her own for a test, then later her company subscribed for QBO after the test. Now, she was sent an invitation as a Standard User with the same email ID used for the Trial. However, QBO does not allow her to accept the invitation to enter her new password for her company's QBO Account. It is rather asking her for the old password used for the trial of which she has forgotten. 

Please I hope this is clear now.

Thanks