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Just wanted to provide more details:

- This ScriptableObject (SO) variant should build a Standalone Windows build set to IL2CPP. Didn't work.
Set it to Mono, also didn't work.
- this BuildAutomation stuff is a custom package added via git through the PackageManager

However: I don't know if this is a valid fix, but this worked:
- Located the asmdef of Ludiq.PeekCore.Runtime

- Exluded Windows 32/64-bit Platform

- Mono AND IL2CPP Builds worked

I need confirmation that this is a valid workaround for now or if this will break anything else In Editor or within the builds until there is a fix.