Hi,
Thank you for posting in Microsoft Q&A forum.
1,Please help check the smspxe.log on the server to see if there is any useful information.
2,Please confirm that you have deployed the task sequence to unknown computers or your collections and distributed the boot images to your PXE enabled distribute points.
3,Do the clients are in the same subnet/VLAN with the distribute points and DHCP server? If not, please configure IP-helper to see if it works.
Thanks for your time. Have a nice day!
Best regards,
Simon
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