I have the same issues with AppEnum parameter with AppIntent, as it doesn't resolve correctly in 26.5 simulator. It seems to still work with a physical iPhone device. When my widget button action/ shortcut suddenly stopped working, it took me 8 hours to discover that the 26.5 simulator was causing the issue after Xcode and simulator upgrade. I redownloaded the old 26.4 simulator and got it working again. If anything was changed with AppEnum in 26.5, it's not stated anywhere in the Apple Developer release notes and documentations. In 26.5 simulator it throws cryptic message in log "Programming error: a caseDisplayRepresentations entry for AppEnum case "to-0.0" was not found. This case will be ignored." What the hell is case "to-0.0", it's certainly not one of mine AppEnum case, I don't know where it coming from. But certainly looks like it's breaking somewhere inside framework within 26.5 simulator.