Unable to add nodes into Replicaset

Below is the config file

mongod.conf

for documentation of all options, see:

http://docs.mongodb.org/manual/reference/configuration-options/

where to write logging data.

systemLog:
destination: file
logAppend: true
path: /database/log/mongodb/mongod.log

Where and how to store data.

storage:
dbPath: /database/data/mongodb
journal:
enabled: true

engine:

mmapv1:

wiredTiger:

how the process runs

processManagement:
fork: true # fork and run in background
pidFilePath: /var/run/mongodb/mongod.pid # location of pidfile
timeZoneInfo: /usr/share/zoneinfo

network interfaces

net:
port: 27019
bindIp: 127.0.0.1,hostname # Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting.

#security:

#operationProfiling:

#replication:
replication:
replSetName: “SNT-NP-DEV-rs01”

#sharding:

Enterprise-Only Options

#auditLog:

#snmp:

One thing to share here, while doing rs.status(), host name showing as localhost not the actual hostname.
“members” : [
{
“_id” : 0,
“name” : “localhost:27019”,
“health” : 1,
“state” : 1,
“stateStr” : “PRIMARY”,
“uptime” : 5876,
“optime” : {
“ts” : Timestamp(1654867891, 1),
“t” : NumberLong(1)
},