Unable to build for iOS on Mac

I feel like I had this problem in 4.18 and solved it by fixing permissions, but that doesn’t seem to be working this time.

The automation tool fails with exit code 5.

A fresh install of the engine also does not help.

I’ve attached both build logs, but it’s not clear to me why the build process is failing.

uat_log.txt

UnrealBuildTool-2018.04.01-20.26.56.txt

I have a similar issue. Not quite identical. I will be watching.