Cloning and replication slots

I want to set up replication between two of my databases One is an Aurora database in PG 10 the publisher, and the other one is an RDS database

#max_replication_slots = 10 # max number of replication slots replication launcher exited with exit code 1 user

replication slot already exists pid integer usesysid oid usename

replication slot postgres Initial Synchronization Worker: Synchronizes initialexisting data from the publisher by creating a temporary replication slot and running a