No longer able to build on windows using sysenv

Development Platforms
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2

But there’s no string escaping there, it’s read as if its a regular code identifier. What happens when yo use

build_flags =
    -fexceptions
    -D MESH_PREFIX=\"${sysenv.MESH_PREFIX}\"
    -D MESH_PASSWORD=\"${sysenv.MESH_PASSWORD}\"

instead?

(Reference: How could the main.cpp read the parameters at platformio.ini? - #3 by maxgerhardt and Removing Secrets from SRC - #16 by gzor)