Does the TFS 2015 server maintain two separate lists of check in policies which are enforced for a team project -- one for the Visual Studio client and another for the Team Explorer Everywhere client? This appears to be the behavior I am seeing.
If I look at the Check In policy settings for a Team Project via Visual Studio I see a number of Check In policies configured. If I look at the Check In Policy settings for the same Team Project via Team Explorer Everywhere I do not see any check in policies. Likewise, if I add a check in policy via Team Explorer Everywhere for a specific Team Project it does not show up if I query the check in policies via Visual Studio.