FRITZ!Box IPSec VPN only gives access to Router but no Device on Network

I have tried to create a VPN using the FRITZ!Box 6490 builtin service. It has only IPSec available (no Wireguard). I have create a profile for my user and it looks similar to this:

VPN-Daten:

VPN-Typ: “IPSec” oder “IPSec Xauth PSK”

Name / Beschreibung: Individueller Name für die Verbindung

Serveradresse / Server: ***.myfritz.net

IPSec-ID / Gruppenname: Till

IPSec-Schlüssel / Shared Secret: ***

Nutzername / Account: Till

Passwort: Kennwort des FRITZ!Box-Benutzers “Till”

So now, I tested this with my Mac and my iPhone which give me the same result: I can connect to the VPN and use it to access one single device: The Fritz!Box router itself. Any other device on the network will not be found.

Does anybody know what I am doing wrong? Thanks a lot for any help in advance!