In Aurora RDS Replication bin_log always OFF

I have created a DB Cluster Parameter group.

Create a parameter group: aws rds create-db-cluster-parameter-group
--db-cluster-parameter-group-name repl-clstr-param-group
--db-parameter-group-family aurora-mysql5.7
--description "Prod repl cluster parameter group by YA"

Modify binlog_format to ROW: aws rds modify-db-cluster-parameter-group
--db-cluster-parameter-group-name repl-clstr-param-group
--parameters "ParameterName=binlog_format,ParameterValue=row,ApplyMethod=pending-reboot"

Then assign this DB cluster parameter group to the database cluster.

aws rds modify-db-cluster
--db-cluster-identifier my-db-cluster
--db-cluster-parameter-group-name repl-clstr-param-group --apply-immediately

Then I rebooted cluster, rebooted instances(both writer and reader).

I have tested it initially in a test DB where the replication is working perfectly but the same db cluster parameter group when I assigned and rebooter cluster it did not work for me.

In Production DB SHOW VARIABLES LIKE 'binlog_format'; binlog_format = ROW

show variables like 'log_bin'; log_bin = OFF** (It is ON in the Test DB)**

repl-clstr-param-group(In Sync)

Anything can be done?

BTW: I have followed the following URL to setup Replication. https://aws.amazon.com/blogs/database/perform-cross-account-amazon-aurora-mysql-migration-with-minimal-downtime/ As I said, this guideline works perfectly for test database.

And followed the following URL to reboot the clusters after enabling the db cluster parameter group. https://repost.aws/knowledge-center/enable-binary-logging-aurora