you can check the content of the extra.security file using a notebook:

%sh

cat /databricks/spark/dbconf/java/extra.security

This should be what is in the article.

The script will set the jdk.tls.dsiabledAlgorithms parameter in java.

So you can check the java parameters on your cluster with

%sh

java -XshowSettings:all -version

the disabledAlgorithms should be set.

If everything is set as it should be, you will have to check logs on databricks side and neo4j side to see what is going on.