Asus DDNS config issue

[Fezzik]

Hi everyone. I have a configuration issue I can not figure out. I am trying to use the free Asus DDNS at 3 different locations. I have 3 asus routers. Two at 2 different offices (RT-66U x2 ) and one at home (RT-68U). I have comcast at all 3 locations.
I have a server at all 3 locations.

1.)At home I have server 2012r2 essentials, NO domain, and the asus router is handeling DHCP. I was able to easily configure the DDNS with no issues

2.) At both offices I have server 2012 at one office and 2012r2 at another (non essentials edition). I have a domain at these 2 offices and the server is running DHCP. Problem is that I can not use the asus ddns. Am I just out of luck!?!?!?

Things I have tried.
1.) if the asus router is put into access point (AP) mode I do not have any options to use DDNS.
2.) I have put the router into wireless router mode and assigned an ip to it, then turned off dhcp. Get the error.
"The wireless router currently uses a private WAAN IP address (.......)
The router may be in multiple environment and DDNS service cannot work in this environment"

Thanks for the help!

 

[RMerlin]

DDNS can only be used if your router is fronting the Internet. If it's behind another router then it won't work.