Gradle can not find existing artifact?

Gradle v4.10.2

This really bothers me, since I know it should work, and I feel like I’m setting up my build.gradle file correctly.

I built a plugin and deployed it to our AWS S3 Maven repo.

When I run a Gradle command, e.g., ./gradlew clean, I get

I have this in my build.gradle file

buildscript {
  repositories {
    maven {
      url s3_bucket
      credentials(AwsCredentials) {
        accessKey AWS_ACCESS_KEY
        accessKey AWS_SECRET_KEY
  dependencies {
    classpath "com.zift.utilities:zift-version-plugin:0.0.1"

What am I missing?