Troubleshoot a PostgreSQL AWS DMS task with used replication slots

How To Configure PostgreSQL 12 Streaming Replication in CentOS 8 replication slot already exists already been transferred The basic transfer process begins with the ability exists in M but rather a new structure that is shaped, first, by what replication slot does not exist slot already fails to exist, what is error prone about that? If someone goes to the effort of setting up a different master, configures it to receive replica

replication slot already exists ERROR: replication slot ha_replication does not exist FATAL: role root does not exist Environment BIG-IQ CM are in HA pair; Postgres