ssid not broadcasting

In the SSID (interface) configuration, check that the "Broadcast SSID" option is enabled.

Check the FortiAP profiles that are assigned to the PU221E to see if the SSIDs are assigned properly - if not set to auto then manually add the SSIDs. 

I am assuming the PU221Es are authorized on the 101E. 

If the above checks out and both Aps have valid/routeable IPs can can be seen by the 101E, check the WiFi Health Monitor and Rogue AP Monitor for possible interference.

Edit: also on the FortiAP profiles, check to see there are actual channels assigned.