pgBackRest on old installation

list,

I am trying pgBackRest on an RHEL 7.6 and old EDB 10 database cluster( a
legacy application.)

I have installed pgbackrest through package install on RHEL7.6
But unable to get the basic stanza-creation working It throws an error.

* /etc/pgbackrest.conf as follows..*
################################################
[demo]
pg1-path=/app/edb/as10/data
pg1-port = 5444
pg1-socket-path=/tmp

[global]
repo1-cipher-pass=sUAeceWoDffSz9Q/d8sWREHe+wte3uOO9lggn5/5mTkQEempvBxQk5UbxsrDzHbw

repo1-cipher-type=aes-256-cbc
repo1-path=/var/lib/pgbackrest
repo1-retention-full=2
backup-user=postgres

[global:archive-push]
compress-level=3
#####################################################

[root(at)dbs ~]# pgbackrest version
pgBackRest 2.48
[root(at)dbs ~]#
#####################################################

*Postgres conf as follows... *

listen_addresses = '*'
port = 5444
unix_socket_directories = '/tmp'

archive_command = 'pgbackrest --stanza=demo archive-push %p'
archive_mode = on
log_filename = 'postgresql.log'
max_wal_senders = 3
wal_level = replica

#############################################

*ERROR Getting as follows .. What went wrong here ??*

[root(at)dbs ~]# sudo -u postgres pgbackrest --stanza=demo
--log-level-console=info stanza-create
2023-11-20 21:04:05.223 P00 INFO: stanza-create command begin 2.48:
--exec-id=29527-bf5e2f80 --log-level-console=info
--pg1-path=/app/edb/as10/data --pg1-port=5444 --pg1-socket-path=/tmp
--repo1-cipher-pass=<redacted> --repo1-cipher-type=aes-256-cbc
--repo1-path=/var/lib/pgbackrest --stanza=demo
WARN: unable to check pg1: [DbConnectError] unable to connect to
'dbname='postgres' port=5444 host='/tmp'': connection to server on socket
"/tmp/.s.PGSQL.5444" failed: fe_sendauth: no password supplied
ERROR: [056]: unable to find primary cluster - cannot proceed
HINT: are all available clusters in recovery?
2023-11-20 21:04:05.224 P00 INFO: stanza-create command end: aborted with
exception [056]
[root(at)dbs ~]#

It complains about the password. I followed the below tutorial link, but
no mention of password (Where to supply password, what parameter where ?)
setting here ==> https://pgbackrest.org/user-guide-rhel.html

Any hints welcome.. What am I missing here ??

Best,
Krishane