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The error indicates that the property you are trying to reach is only looking in the

Credential

object. Try prefixing it with

settings

. Note that Gradle has a gap in documentation on this topic, which is addressed for the future 7.6 release. See https://docs.gradle.org/nightly/userguide/build_environment.html for details and different notations.

Is there any reason to not doing directly instead of loading the Properties manually?

val prop = target.getProperty("your prop")