I suspect if DHCP broadcast packets are reaching DHCP server.
Please try below.
If above is not working, you can take packet captures from the AP using wireshark and review (a bit advanced level if you are a normal user).
Also check and if you are using DHCP relay. Cross check if you are able to ping DHCP server IP address from the AP CLI.
If nothing works, feel free to open a support case for more help.