Information you have provided is very limited.
There could be many reasons if client is not getting IP address.
Some common points to check:
- SW port should be configured as trunk, if you are tagging VLANs on WLAN.
- VLAN configuration on switch port (make sure tag the desired VLANs which are configured on WLAN settings, other than VLAN 1).
- WLAN advanced VLAN configuration.
- DHCP reachability.
- Relay agent/helper IP configuration, if server is not on same VLAN as requested IP address
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