the problem remains,
the configuration is the simplest as in the example of the Huawei Hedex (example for configuring a dhcp relay agent - dhcp relay agent and dhcp server on the same network).
directly connected vlan where is the dhcp server:
interface XGigabitEthernet0/0/1
port link-type hybrid
port hybrid tagged vlan 380 389
interface Vlanif380
ip address 17.9.6.209 255.255.255.252
and vlan for users:
interface Vlanif329
ip address 17.9.6.201 255.255.255.248
dhcp select relay
dhcp relay server-ip 17.9.6.210
interface GigabitEthernet0/0/1
port link-type hybrid
port hybrid tagged vlan 329
dhcp enable
Sep 20 2021 10:04:51.174.1+04:00 HUAWEI5720_Michurina74 DHCP/7/DEBUG:[DHCP-pkt]:Receive DHCP packet (srcif:-1-null orgif:-1-null destif:GigabitEthernet0/0/1 length:383 mflg:BC/BC).
Sep 20 2021 10:04:51.174.2+04:00 HUAWEI5720_Michurina74 DHCP/7/DEBUG:[DHCP-info]:Message with options: 53 54 56 82
Sep 20 2021 10:04:51.174.3+04:00 HUAWEI5720_Michurina74 DHCP/7/DEBUG:[DHCP-pkt]:Receive DHCP NAK message.orgif:null srcif:null L3if:null DstIf:GE0/0/1 srcmac:68cc-6ea8-027f dstmac:ffff-ffff-ffff vsi:- vlan:329/0 srcip:17.9.6.201 dstip:255.255.255.255 VPN:- src-port:67 dst-port:68 msgtype:BOOT-REPLY dhcp msgtype:DHCP NAK bflag:uc chaddr:50ff-2024-121b ciaddr:0.0.0.0 reqip:0.0.0.0 giaddr:0.0.0.0 serverid:17.9.6.201 yiaddr:0.0.0.0 xid:0xbf187c23
Sep 20 2021 10:04:51.174.4+04:00 HUAWEI5720_Michurina74 DHCP/7/DEBUG:[DHCP-info]:The packet with option56:Requested IP address not in pool
Sep 20 2021 10:04:51.174.5+04:00 HUAWEI5720_Michurina74 DHCP/7/DEBUG:[DHCPSNP-pkt]:Receive DHCP NAK message.(srcif:null, srcl2if:null, dstif:GE0/0/1, vsi:65535, vlan(O/I:329/0), mac(client:50ff-2024-121b src:68cc-6ea8-027f dst:ffff-ffff-ffff), port(src:67 dst:68), bd:0, vxlan(src:0.0.0.0,dst0.0.0.0,src-ipv6:::,dst-ipv6:::))