Cannot apply plugin by id in init.gradle script

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I too am getting the error “…unknown property ‘com’”

I have a project that creates a custom wrapper which includes a script in init.d named artifactory.gradle

initscript{
	Properties properties = new Properties()
	properties.load(new File(getGradleUserHomeDir(), 'gradle.properties').newDataInputStream())

	repositories {
		maven {
			url properties.artifactory_contextUrl + '/gradle-plugins-virtual'
			credentials {
				username = properties.artifactory_user
				password = properties.artifactory_password
			}
		}
	}
	dependencies {
		classpath "org.jfrog.buildinfo:build-info-extractor-gradle:4.17.2"
	}
}

apply plugin: com.jfrog.artifactory  //unknown property com
// apply plugin: 'com.jfrog.artifactory'  //gives plugin not found error

println "artifactory.gradle - called"

when I run a project configured to use this wrapper I get the errors indicated here.

Any help appreciated. How do I verify my classpath?
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