30th June 2017 is just a couple of weeks away – so please be sure you have upgraded either to Project Professional 2016 or are running the subscription model and are actively updating to at least the deferred channel. Although RTM is acceptable for Project Professional 2016 you should consider patching to a more recent update. A list of the fixes we have made from the initial release to June 2017 can be found at https://blogs.technet.microsoft.com/projectsupport/project-2016-public-updates/.
If you are still running Project 2013 then you will not be able to connect to Project Online once this deadline passes. As mentioned recently for the site creation changes – the Message Center is the place to learn about this and other changes. This or a previous version has been posted since 19th August 2016 – so you have had plenty of time – don’t leave it any longer!
This won’t affect you if you just use Project 2013 and don’t connect to Project Online – but the upgrade is worth considering anyway.