I am adding it like so:

repositories {
    maven(url = "<https://maven.jetbrains.space/[my-org]/[my-repo]>")
}

Which issue do you get with it? Maybe it requires some credentials? https://docs.gradle.org/current/dsl/org.gradle.api.artifacts.repositories.MavenArtifactRepository.html#org.gradle.api.artifacts.repositories.MavenArtifactRepository:credentials

It's a 401. It needs credentials in order to use, but I thought they were supporting open source repositories. Perhaps not yet 😞