Maven-ant-task cannot connect to HTTPS repository with authorization

I have an internal Maven repository that can only be accessed via HTTPS with authorization. I have setup everything in settings.xml and have the correct .jks file to access the repository.

My goal is to download dependencies from that repository.

Command "mvn -Djavax.net.ssl.trustStore=my.jks package" runs ok - dependency is retrieved. But if I try to use maven-ant-tasks and retrieve dependencies from ant - I got the "missing artifact" errors.

Here's part of my ant script that does the copying:

<artifact:pom id="main.project" file="pom.xml"/>
<artifact:remoteRepository id="rep" url="${repository}"/>

<artifact:dependencies  pathId="dependency.classpath"
                        filesetId="dependency.fileset"
                        versionsId="dependency.versions">
    <pom refid="main.project"/>
    <remoteRepository refid="rep"/>
</artifact:dependencies>

<copy todir=".">
      <fileset refid="dependency.fileset" />
     <mapper classpathref="maven-ant-tasks.classpath"
                 classname="org.apache.maven.artifact.ant.VersionMapper"
                 from="${dependency.versions}" to="flatten" />
</copy>

I run ant as:

ant -Djavax.net.ssl.trustStore=my.jks

And here's what I'm getting:

[artifact:dependencies] An error has occurred while processing the Maven artifact tasks.
[artifact:dependencies]  Diagnosis:
[artifact:dependencies]
[artifact:dependencies] Unable to resolve artifact: Missing:

I ran procmon and it seems that maven-ant-tasks doesn't attempt to use the .jks to access the repository over HTTPS.

The pom is pretty simple and just includes a single dependency.