HI,
Can you describe the issue little more.
1. Is eth port of IAP2 witch is latched to IAP1 is up, can you see any link activity.
2. If the link activity is there, check the VLAN assignment, and IP assignment method
Please ensure the following,
1. Client IP assignment is Network assigned
2. Native VLAN is same as the IAP1 uplink native VLAN
3. First of all , ensure the IAP1 uplink is trunk and the native vlan is configured same as the uplink device port native VLAN
To configure VLAN and IP assignment look at the following snapshot.
Please feel free if the issue is not resolved.