you may not be able to open your external IP up internally if your router does not support NAT reflection... are you trying it from a mobile connection?
Needs to be configured like:
externalip:8585 -> internalip:8585
I would not worry about calling tech support; your "server" your running is to monitor your home security cam, people have to do it all the time for video game consoles, home automation, etc.. if they have a problem with that then let them terminate your service imho; they want your money and dont give a crap what you do with it.. they may try to upsell you to a higher tier tho; thats normal.