Maven Plug-In goal updateSQL - Generated sql file is empty


I’m new to LiquiBase, so please bear with me. My SQL file does not show any generated SQL.
I’m running Liquibase with the maven plugin. The changeset file is executed and my database changes have been applied.
However I don’t see any SQL. I would like to generate the sql to the file path I specified in the POM with the migrationSqlOutputFile property. Am I missing something?

Please advise…