PXE UEFI_ACI_Infoblox_Failed

[NDP]

We have scenario as following

two bridge domains in one Tenant

PXE DP server is in one bridge domain

PXE ClientVM VLAN is in another bridge domain

1:1 bridge domain --EPG association 

Infoblox DHCP server for scope is available over L3Out 

for client VM bridge domain, We have added the DHCP relay servers with Infoblox IP address & PXE DP server as suggested by Microsoft team

We observed that with an option 60 ( string in infoblox PXEClient), VMs got an IP address and not getting image downloaded from DP server.

VM console displays an error " PXE-E55: proxyDHCP service did not reply to request on port 4011." 

We have required contracts enabled between ClientVM EPGs and DP serevr EPGs.

Could someone suggest me if any changes are required on bridge domain of ACI to get it resolved. the same was working earlier when VLAN was on legacy network. 

thanks in advance

[Josh-R]

In order to get this working we've had to apply DHCP helpers and Helpers to the WDS servers at the Switch level.
This causes issues for us from a MGMT perspective. I don't know how else to do it via Infoblox that appears to work. If anyone does, that would be great to know, but i believe that WDS doesnt like option 66/67 being used... as I've seen suggested to use within Infoblox at the subnet level.