Dotnet mvc 4 setup no longer working after framework upgrade to 4.7.2

We had setup a working authentication scheme and all was good on 4.6.1. However we noticed things are no longer working for a few months and the only thing we’ve touched is installing and targeting the new framework version. The funny part is it is successfully going through the entire process and I can debug through the notification being received and can walk all the claims, however once it leaves that code it’s as if it never happened and no User is set, no claims exists, the Request is not Authenticated. Again we hadn’t touched this code in a while and the only notable change was an upgrade the the dotnet framework. Any suggestions?