Hi @chewkheng,
The user-mapping.xml file is not created by default in our installations. According to the official documentation, it needs to be placed inside the GUACAMOLE_HOME directory. That directory is /opt/bitnami/guacamole in our installations.
https://guacamole.apache.org/doc/1.2.0/gug/configuring-guacamole.html
Please try to create the user-mapping.xml file with the required configuration and restart the services. Remember that you can also access the admin dashboard of the application and configure the SFTP there

Happy to help!
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