But your earlier post gives different error with SRV string(no digits)
Did your try with doble quotes as Steeve suggested?
or create a test user and share pwd for us to check
I tried your string with some id/pwd
It gave authentication error
or try long form of connect string which has names of all 3 nodes of your cluster with replicaset name
It is possible your are using a DNS resolver that does not support DNS seedlist
Also make sure no vpn/firewall,anti virus issues blocking your connection