If you encounter the 'error 200' when trying to pair your device with your internet browser, it means the port 443 on your router is not opened.
We use this port to establish a connection with the middleware that is a platform between your device and your web browser.
Note that on classic routers/internet box, this port is already opened. Error 200 generally occurs when you use a specific router or when you are connected to a company network with a firewall.
The port forwarding procedure is different according to your router interface so we can't help you on that topic but you'll find all the information you need on the router's manufacturer website.