@Cody23  I have not used a CPE710 by itself in AP mode before, but based off the information you have given, it does not sound like the ideal setup. Does the below match your topology for the most part?

[BARN] WIFIBooster  )))    ((( CPE710___ Router / Modem [HOME]

Check for firmware upgrade on CPE710 but In my opinion, for the best results, you need another CPE710 placed at the barn.

[BARN] Acess Point__CPE710 Client Mode )))   ((( CPE710 AP Mode___Router / Modem [HOME]

  @RickJamesBish Thanks for the reply. Yeah that matches how I have it setup. I will check for a firmware update. I did purchase 2 units initially but thought I would try it first with only one to see if it reached that far. It is also nice to have the wifi in the backyard of the house as the original modem/router doesn't reach that far.

I will try with a cpe710 authentication barn and see how that goes. 

  @Cody23 another option, and a configuration I have used and am still using on my daughters RV.

(Internet) Modem / Router > Switch > EAP610 Outdoor - - - - - - CPE710 < Router in RV.

The CPE is in client mode joined to the EAP610 Outdoor 5Ghz Channel 161. The EAP610 OD is also in MESH with 4 EAP225 Outdoor.

If you did something like this you would get outside Wi-Fi coverage in the back yard and also get internet to the barn.

[Barn] ?? >CPE710 - - - - - EAP225 OD < Modem / Router in house

The ?? would be a device inside barn to receive from the CPE710 whether it be a wireless router or an indoor AP.

  @RickJamesBish OK thanks again I will try that option as well. I havent been able to try anything yet but will hopefully get to it in the next day or so. Do you think having it in AP mode or AP Router mode would make a difference. I haven't been able to find the difference between the 2.