Unable to add nodes into Replicaset

Hi ,
Again having issue today to add nodes into replica set .
I stopped mongod services and while starting all nodes went secondary .To make one node primary, i have removed all nodes except one node by command(conf.members.splice(1,2) ).
Then that node automativally come to primary node and when i start to add other nodes, its not adding now.Getting below error. Please help on this issue.

Error:
SNT-DEV-rs01:PRIMARY> rs.add(“hostname:27019”)
{
“operationTime” : Timestamp(1655109480, 1),
“ok” : 0,
“errmsg” : “Quorum check failed because not enough voting nodes responded; required 2 but only the following 1 voting nodes responded: hostname:27019; the following nodes did not respond affirmatively: hostname:27019 failed with Error connecting to hostname:27019 (10.36.7.42:27019) :: caused by :: Connection refused”,
“code” : 74,
“codeName” : “NodeNotFound”,
“$clusterTime” : {
“clusterTime” : Timestamp(1655109480, 1),
“signature” : {
“hash” : BinData(0,“AAAAAAAAAAAAAAAAAAAAAAAAAAA=”),
“keyId” : NumberLong(0)
}
}
}