I'm trying to setup a raspberrypi 4 as a wifi access point. Following the official documentation I managed to bridge my eth0 interface and setup hostapd. The bridges IP is provided by an exisiting DHCP server on the network in contrast to the documentation. The problem I'm facing is that none of the connected wifi devices are getting an IPv4 address. They are capable of connecting to the internet by IPv6 though but then fail to connect to any IPv4 target on the internet. Browsing IPv6 based websites works fine from any wifi client (Android or Windows 10).
Linux raspberrypi4 4.19.75-v7l+ #1270 SMP Tue Sep 24 18:51:41 BST 2019 armv7l GNU/Linux hostapd v2.8-devel