Be Informed, Project Online Requirement are changing
In this blog, i just want to share that by end of February 2017 you will need to be running a current version of Project Online Desktop Client (Microsoft Project Professional 2016 or Project for office 365). If you are running on subscription version you should be fine as we will get updates regularly.
You can ask me how to check the versions of Subscription-refer to this link
if you are running project professional 2013 then you will no longer be able to connect to Project Online and will need to either upgrade to one of new subscriptions that includes desktop client or upgrade to Professional 2016.
Have you seen the new TimeLine Bar?