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Maybe try these commands on both environments:

```dotnet --list-sdks
dotnet --list-runtimes
dotnet --version```

Yep - exactly the problem.  Now I just need to work out how I install dotnet &gt; 6.0.200 via brew on Mac.  I uninstalled the standard “dotnet”, which was at 6.0.1x and installed the 7.0.0-rc1 version via a cask.  It escapes me how I’m supposed to install dotnet v6.0.400 via brew though… Thanks for your tip - that led me to look at the docs w/resp to min version of dotnet required for the features I’m using and your commands then helped me see that Mac doesn’t have the right version).

I just didn’t bother with brew.   installed pkg via m/soft website.  job done.

If you put a global.json file in with the Pulumi code you can specify which runtime to use. Helpful when you've got more than on installed... Expecially RC's