As the title says I could not find any Sessions with these UE versions. As a test I tried downloading the project files for this lesson (11 Query Parameters & Session Settings) from Github. But that showed the same behavior after converting the project to 4.27 or 5.0. After that I installed UE 4.17 (the same as in the Github) with VS 2017 and with that everything works fine with the same sourcecode. Do you know of anything I need to change from the shown sourcecode to make it work with newer UE versions?
Edit: I even tried running packaged versions with the same issues.