Open connection between IP Camera+DDNS service on N600 router

N600 router, vanilla grade security IP camera running on 192.168.0.110
tried at ports 80, 90 99, etc. No difference

Set up port forwarding, The camera cannot connect to the DDNS service,
it is blocked.

Enabling UPNP does nothing, even though the camera supposedly supports UPNP.

I even set the DMZ to the device… nadda.

What else do I have to do? so that the camera gets through?

I have read the manual, and have been doing this stuff for years. Any other router would be set and done by now, but you guys have something else hidden?

Support ticket form does not accept model or ser number Phhhhtttt
Call support number, no option for legacy MY NET products Phhtt
I have spent almost 1.5 hours just getting this question HERE…

Anybody know how to make the N600/700/900 router work with an IPCAM and a DDNS service??? Have done it, seen it work?

Hopefully an experience User will be able to assist.