Insert this as connection string:
mongodb://root:tdyK2sHGq3l3jfQVukAn@comms-p-db-01.global.un.org:27017,comms-p-db-02.global.un.org:27017,comms-p-db-03.global.un.org:27017,comms-p-db-04.global.un.org:27017/?authSource=admin&replicaSet=rs0
Connect to MongoSH as admin:
mongosh -u root -p --authenticationDatabase admin
tdyK2sHGq3l3jfQVukAn