Any updates? I've also had the same issue, long with quite a few others in the threads

I've been dealing with this for weeks now with no luck. I've been able to install iOS 17 on another machine running an older OS but the second I get into Tahoe, no simulators install.

I’ve had this same issue for over 2 weeks now and it’s extremely frustrating. I haven’t been able to do any work all this time. Same issue when I was on 26.1. I was forced to update everything and it seems fairly new so nobody has posted anything about it (you’re the first I’ve seen online to bring it up). I’ve done reboots, fresh installs, downgrades of Xcode, downgrades of Simulator (none of which work, but I was able to manually install the iOS18.2 Simulator for nothing because Xcode still wants me to use iOS 26). At this point I think opening an issue might be the best course of action because I can’t keep going on without any progress.