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Well, it's there (or should be): <https://plugins.gradle.org/plugin/com.gradle.enterprise>
Can you show the pluginManagement section of your settings script? and any buildscript block you could have in build scripts.

Do you have some Firewall or similar?
The artifact it complains about is not directly hosted on "Gradle Central Plugin Repository" which is in the list of your plugin repositories, but it answers with a redirect to <https://plugins-artifacts.gradle.org/com.gradle/gradle-enterprise-gradle-plugin/3.12.3/beee302685841a39c431f2cbc56f39c8592a1a574855cd950a5e09b5475bbed1/gradle-enterprise-gradle-plugin-3.12.3.pom|https://plugins-artifacts.gradle.org/com.gradle/gradle-enterprise-gradle-plugin/3.12.3/beee[…]9b5475bbed1/gradle-enterprise-gradle-plugin-3.12.3.pom>, so if you for example are not allowed to access <http://plugins-artifacts.gradle.org|plugins-artifacts.gradle.org>, it cannot be resolved.