Elden Ring is a well-famed game that has fans all over the globe. While playing the co-op, players have complained about the “Elden Ring unable to summon cooperator” quite often.
The error is likely to appear when someone else has summoned a similar operator before you. However, if this is not the case then there are other reasons as well causing the problem.
So, if you are also seeing the “Unable to summon cooperator, failed to join session error” then follow the below-given fixes one by one till you find the one that works for you.
Hardeep has always been a Windows lover ever since she got her hands on her first Windows XP PC. She has always been enthusiastic about technological stuff, especially Artificial Intelligence (AI) computing. Before joining PC Error Fix, she worked as a freelancer and worked on numerous technical projects.