Publish maven packages to github maven packages

I have a repository that contains multiple maven projects and I want to publish it to github maven packages. Allready spended hours to try to get it working but without success.
What I am doing wrong?

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy (default-deploy) on project rest-parent: Failed to deploy artifacts: Could not find artifact com.github.potjerodekool:rest-parent:pom:1.0 in github ( → [Help 1]

Did today another try I got now working.

In settings.xml