SharePoint permissions not getting defined according to SharePoint groups

Question

I have done migration from Project Server 2013 to Project Server 2016. All sites got created. Projects, tasks, users created finely. The issue is no other user is able to access. I find that there is no permission given to any user although they are put in one or more SharePoint groups same as the previous environment, where it was OK. I don't understand why SharePoint permissions are not defined according to SharePoint group.

Answer 1

This got resolved that time. I had to change the permission mode to resolve this.