I had a similar, but different issue. My issue was never resolved, but I found a work around. I installed it on my second SSD, and it worked fine. I cannot get it to work on the original SSD it was on. Mine is likely an Xbox credential corruption issue or Steam issue that occurred following an internet outage during updating - more here: [Unusable Sim] Unable to log in to sim after failed update attempts - #6 by Matt72580