Based on your description, PWR LED blinking Green means that the Access Points are not getting an IP address from router. Please confirm the cable connection of your device.
Check if the port the AP is connected to is providing DHCP services on the Native/Default VLAN.
The versions must match for the AP to join the network unleashed existing
1-Connect the AP to your router to get a valid IP
2-Ssh to the IP, default credentials are admin/sp-admin
3-Run the following command > show version
4-Confirm the version of the AP
Most common Setups for Lennar homes users
Also let me add more detail to understand the LED lights of your Access points.
R510 LED lights
Lennar Home Community