enabling BINARY LOG on AWS RDS MySQL Context

I am trying to enable BINARY LOGs on a MySQL RDS instance.

Issue

I used CALL mysql.rds_set_configuration('binlog retention hours', 24) without encountering an error.

And using CALL mysql.rds_show_configuration says "binlog retention hours" value is 24 

But SHOW BINARY LOGS says "#1381 - You are not using binary logging"

Am I missing something ?

Additional information :


using SHOW GRANTS results in GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP...
I tried rebooting the instance. It didn't work.
automatic backups are enabled with a 1 day retention


useful documents


Using a Amazon-Managed MySQL-Compatible Database as a Source for AWS DMS 
AmazonRDS/latest/UserGuide/mysql_rds_set_configuration
I found this blog post that answered the question: https://blog.pythian.com/enabling-binary-logging-rds-read-replica/

Essentially, if you make sure your "Backup retention period" for your RDS instance is set to > 0 days, this will enable binary logs.