iOS simulators iOS 12 / iOS 12.1

Can someone please enlighten me here .

I can't get iOS simulators to work with Animate 2018 on my Mac,  despite following the guidelines suggested on the recent AIR 32 SDK release notes and from forum posts etc.

Is it actually possible at this time  ? ... has anyone succeeded ?

Animate 2018 produces  an "invalid input" error  when using "Test Movie/On iOS Simulator" ,  even when building an empty app .

Builds on the command line fail  with the error   "Compilation failed while executing : ld64"

I've copied over the correct ld file  from Xcode as prescribed renaming to ld64  and have the right paths to the SDKs etc.

I've tried using Xcode 10.0 -  iOS 12  and Xcode10.1 -  iOS 12.1 ..

Just hitting a brick wall with this ..