Due to a security recommendation from Google over the weekend, a bulk update of all user accounts (excludes shared inboxes for TL services/OC's) has been implemented to require a password reset upon a user's next login.
For any users on a Pixelbook, a user will more than likely be asked to create the new password, AND supply the most recent password (authenticates change with cached credential that was saved locally to the device).
Users should also expect to sign back into any Google related apps on their mobile devices.
We understand questions may arise from this change, and if they do, please let us know.