Client works on Linux & Mac with Tunnelblick, fails on OpenVPN Connect iOS & macOS

[sebashb]

EDIT:
I don't know why this post was moved to here, but I'm using the community edition, so I'm not sure if it was moved to the right place.

Server:

• Server is running OpenVPN 2.6.9 x86_64-pc-linux-gnu on a Ubuntu Server 24.04.1 LTS
• Server uses Freeradius 3.2.5 for authentication and to send "Framed-IP-Address" attribute to each client
• client-connect.sh is used to provide additional client configurations
• The server is configured this way in order to provide client-to-client isolation

Server.conf:

port 443
proto tcp-server
dev-type tun
tun-mtu 1500
topology p2p
mode server
tls-server
ifconfig 100.64.0.1 100.64.0.2
route 100.64.0.0 255.255.0.0
push "route 100.64.0.0 255.255.0.0 vpn_gateway"
ca ca.crt
cert server.crt
key server.key
dh dh.pem
tls-auth ta.key 0
script-security 3
verify-client-cert none
username-as-common-name
auth SHA256
auth-nocache
cipher AES-256-GCM
plugin /usr/lib/openvpn/radiusplugin.so radiusplugin.cnf
client-config-dir /etc/openvpn/server/ccd
client-connect /etc/openvpn/server/client-connect.sh
client-disconnect /etc/openvpn/server/client-disconnect.sh
keepalive 10 120
persist-key
persist-tun
verb 3

client-connect.sh:

#!/bin/bash
echo "ifconfig-push ${ifconfig_pool_remote_ip} ${route_vpn_gateway}" > "$1"
echo "push \"route 100.64.0.0 255.255.0.0 ${route_vpn_gateway}\"" >> "$1"

Client:

client
remote server.ip.com
proto tcp
port 443
dev-type tun
tun-mtu 1500
nobind
auth SHA256
auth-nocache
resolv-retry infinite
connect-retry 5 60
user nobody
group nogroup
persist-key
persist-tun
auth-user-pass
remote-cert-tls server
cipher AES-256-GCM
verb 3
<ca>
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
</ca>
key-direction 1
<tls-auth>
-----BEGIN OpenVPN Static key V1-----
-----END OpenVPN Static key V1-----
</tls-auth>

Problem:
When I try to connect to my server either with the iOS OpenVPN Connect App (3.5.0) or macOS OpenVPN Connect App (3.8.2) I get the following error message:

tun_prop_error: ifconfig addresses are not in the same /30 subnet (topology net30)

which is strange since I'm not using a net30 topology.
If I use the exact same client configuration file on Tunnelblick (4.0.1) the client is able to connect without any issue or warning.