Dnsmasq DHCPDECLINE (br-lan) on eth and wifi windows pcs

Hi all,

I am using 1900ACSv2, years on OpenWRT, never had issues, last night I migrated from 19.x to 23.05 latest one and since then I am not able to get my Windows 10 Pro wired eth pc online and another one but on wifi

Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:21 2023 daemon.err uhttpd[1810]: [info] luci: accepted login on / for root from 192.168.1.144
Wed Dec 27 13:28:21 2023 daemon.warn dnsmasq-dhcp[1]: not using configured address 192.168.1.141 because it was previously declined
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) 74:56:3c:66:20:fa
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.110 74:56:3c:66:20:fa
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.166 ce:77:25:ee:26:82
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.1.110 74:56:3c:66:20:fa
Wed Dec 27 13:28:25 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.110 74:56:3c:66:20:fa NT
Wed Dec 27 13:28:28 2023 daemon.info dnsmasq-dhcp[1]: DHCPDECLINE(br-lan) 192.168.1.110 74:56:3c:66:20:fa

Both windows machines non stop decline the IP that the OpenWRT is releasing for them via the DHCP.

Tried it all, stopped ipv6, used ononly ipv4, vice versa, sometimes when I reboot the router occasionally they connect, but then it`s slow.

Tried static leases, tried custom DNS to the WAN interface, what not...

Any ideas where to start? All my phones + NAS + consoles (PS4/5) work fine...

Here my settings for the DCP

DHCP
config dnsmasq
option domainneeded '1'
option localise_queries '1'
option rebind_protection '1'
option rebind_localhost '1'
option local '/lan/'
option domain 'lan'
option expandhosts '1'
option cachesize '1000'
option authoritative '1'
option readethers '1'
option leasefile '/tmp/dhcp.leases'
option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
option localservice '1'
option ednspacket_max '1232'

config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12'
option dhcpv4 'server'
option dhcpv6 'server'
option ra 'server'
list ra_flags 'managed-config'
list ra_flags 'other-config'

config dhcp 'wan'
option interface 'wan'
option ignore '1'

config odhcpd 'odhcpd'
option maindhcp '0'
option leasefile '/tmp/hosts/odhcpd'
option leasetrigger '/usr/sbin/odhcpd-update'
option loglevel '4'

config host
option name 'NT'
option ip '192.168.1.141'
option mac '74:56:3C:66:20:FA'
option leasetime 'infinite'

Did you reset your device in the process?

I had to reset it several times (via the red button - pressing for 10 mins), I installed even an older firm 21.x something but it wasnt ableto save settings after reboot + also was not working.

I used the sysupgradebin update direct from 19.x to 23.05 (via Luci gui). I rather believe the issue is with both windows machines... but I am not sure.