Staging version cannot be accessed

We are migrating from manual maven releases to gradle automatic ones.

My first issue is that we would like to test the staging version before release.
For the version I'm testing I tried the following url's:
https://oss.sonatype.org/content/repositories/staging
https://oss.sonatype.org/content/groups/staging
https://oss.sonatype.org/content/repositories/comadjust-1069
and even https://oss.sonatype.org/service/local/repositories/comadjust-1069/content/ from this old thread https://issues.sonatype.org/browse/OSSRH-19080?focusedCommentId=337950&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-337950

I can see that the staging release is closed and accessible here https://oss.sonatype.org/content/repositories/staging/com/adjust/sdk/adjust-android/4.10.5/
but if I try to add it as a dependency like this "compile 'com.adjust.sdk:adjust-android:4.10.5'" it fails to resolve
The gradle file in question is here: https://github.com/adjust/android_sdk/blob/v4105/Adjust/example/build.gradle

My second issue is that the uploaded artifact is an 'aar' instead of the expected 'jar' that is configured here: https://github.com/adjust/android_sdk/blob/v4105/Adjust/adjust/build.gradle#L80