I have an issue with one of my C200 cameras after doing a factory reset. It will not allow me to view and control it outside of my home network.

After googling the issue and finding this old thread on this site and the issue still persisting, I felt like I needed to make a new thread.

None of my other cameras has this issue after a reset. My home network is set up just fine and changing the DNS does nothing, again no issues with the other cameras. I have a wifi extender, but the issue persists even with it offline. The camera is literally 15 feet away from the wifi router with clear line of sight, having full signal and no packet loss. The camera has worked with no issues up until factory resetting and subsequent readding it in the Tapo app. Camera settings in the app are identical to what they have always been. I have tried a reset 3 times now, going through each step carefully. 

Does anyone have an actual solution here? The above linked thread doesn't show a solution, only a repeated copy-paste answer.