From 11.3, the installation has changed. Before, it was in the control plane, and now it is in the data plane. So basically, installation is done entirely on the cluster. Maybe because of routing settings in your Azure environment, your cluster doesn't have access to https://repo.maven.apache.org/ (before it was in the control plane, so there was no problem as routing was from the databricks side, but that architecture was not correct. That'st's why it was changed)