@LauraMaschietto 

Hi,
You can refer to the instructions below to troubleshoot if you can control the camera only in the local network.
What to do if I can't control my Tapo cameras on the Tapo app?

Please confirm the following information if the reported phenomenon persists.
  1. What's the model number of your router? Do you have an internet connection when connecting to your router's Wi-Fi?
  2. What's the LED status on the Tapo C200, such as solid red, flashing red, etc.?
  3. If there are special settings on your router, such as MAC Filtering, parental control, access control, firewall, etc., please disable or remove them for a try.
  4. You can enable a hotspot Wi-Fi on your phone, factory reset the camera, configure it with another phone, connect it to the hotspot Wi-Fi, and then check if you can control it remotely.

Best Regards