Why do customers still see each other?

Question

openvpn

It is necessary that the clients do not see each other, but only the server, the absence of the client-to-client command does not help, if I remove the topology subnet command, the server does not ping, here is the server config:
dev tun
dev-node "vpn"
proto tcp-server
port 8888
tls-server
tls-auth c:\\OpenVPN\\ssl\\sch.key 0
server 172.16.0.0 255.255.255.0
push route-gateway 172.16.0.1
push route 10.0.0.0 255.0.0.0
topology subnet
push dhcp-option DNS 172.16 .0.1
comp-lzo
dh c:\\OpenVPN\\ssl\\dh1024.pem
pkcs12 c:\\OpenVPN\\ssl\\dc.p12
persist-tun
persist-key
tun-mtu 1500
tun-mtu-extra 32
mssfix 1450
keep alive 10 120
status c:\\OpenVPN\\log\\openvpn-status.log
log c:\\OpenVPN\\log\\openvpn.log
verb 3 Clients
:
dev tun
proto tcp
remote 30.30.30.30 8888
client
comp-lzo
pkcs12 c: \\OpenVPN\\ssl\\cl-1.p12
tls-auth c:\\OpenVPN\\ssl\\sch.key 1
tun-mtu 1500
tun-mtu-extra 32
mssfix
status c:\\OpenVPN\\log \\openvpn-status.log
log c:\\OpenVPN\\log\\openvpn.log
verb 3
If I remove the topology subnet command, I grab the address 172.16.0.10/30 and, accordingly, I don’t see anyone but myself. There is no ping from the server to the client or vice versa. And it is needed, that's what I'm missing? Tell me please.