1) (Atlas MongoDB console) First of all, click on allowing access from ANYWHERE (see figure below) and put some random IP - address, do not click on the Add Current the IP - address otherwise it will not connect to robomongo.
2) robomongo, Connection, Direct Connection Address [ Project-> Clusters → () Primary Cluster-> " "].
3) "", "admin" , "Auth Mechanism" - SCRAM-SHA-1.
4)
5) , !
URI Mongo :
mongodb://[username:password@]host1[:port1][,...hostN[:portN]]][/[database][?options]]