Tez Jars unpacked from tar.gz?

So I have Tez working – or so I thought – until I tried Hive+Tez launched from Oozie. Then I get

Error: Could not find or load main class org.apache.tez.dag.app.DAGAppMaster

That seems to be the entire log.
Now my understanding is that I need to set the tez.lib.uris to something in the workflow xml as well as the tez config file.
eg

<name>tez.lib.uris</name>
<value>hdfs:///hdp/apps/2.2.0.0-2041/tez/tez.tar.gz,hdfs:///user/oozie/share/lib/</value>
</property>

Now I don’t know if I need hdfs:///user/oozie/share/lib/, but it does not seem to be taking the tar.gz file and unpacking it – or else why would I be getting that error?

Any ideas of things to try?