Says its time to change password.
Please give us some time to check and get this fixed. I will keep you updated once the admin demo access is ready again.
Thanks for your patience.
PS. This issue occurs in other sites too https://github.com/magento/magento2/issues/4331
You can access admin demo of UB Mega Menu now. You still see the notice ‘It’s time to change your password’, yet it does not affect the demo. This notification is simply a warning to notify Magento site admin to change password for security reason.