Android devices get IPV6 address as primary DNS server. No IPV6 dhcp on network (Checked)

Hi all

I have some troubles triyin to resolve local dns names on the Android Wifi connected devices.

Our installation:Firewall (that not provide DHCP) USG310 by ZyxelWindows 2019 DC with DHCP v4. No IPv6 Configured.Wifi Ruckus with ZD1200 Controller

If i check the data assigned with DHCP:Get the IP for Our DC server.Primary DNS1: fe80::250:56ff:febe:f93d%wlan0DNS2: Primary DC DNS IPDNS3: Secondary DC DNS IP

Trying to resolve dns that are created by us, failed randomly. because android device first try to resolve into internet dns prior to use the internals.

Test already done:

1. check my Firewall. No ipv6 configs here.
2. check my DHCP, there are NO ipv6 config at all.
3. iPhones, works good, get only ipv4 local dns.
4. Check for rogue DHCP on network, not show anything
5. Connect a windows laptop (wifi) with ipv6 enabled, not get any v6 config.
6. Connect a windows laptop (WIF and LAN), with ONLY ipv6 protocol, not get any config.
7. My ruckus controller, not show any ipv6 configuration that involve this protocol.
8. This kind of IPV6 Address, locks that only local link address, and are not MAC Address vinculated to check the origin.
9. IPv6 is disbled on the WIFI controller...

I´m running out of ideas,Any help willbe appreciated.