When you create a WDS server out of your DHCP server the server option 60 in dhcp for PXE do not exists. To make it do the following steps:
Open a command prompt with elevated privileges and writte:
NETHSH>add optiondef 60 PXEClient String 0 comment=”Option added for PXE Support”
NETHSH>set optionvalue 60 STRING PXEClient
NETHSH>show optionvalue all
next step in my case is add 066 option to say whicc is the WDS server.
I hope it help you!