I think you should be linking using feelconnect not the browser.
To link using FeelConnect, you first need to open a browser (e.g. on computer) and go to POVR, and find the QR code. Then with FeelConnect on your phone, either scan a QR code as shown in the browser, or enter the code which sits below the QR code. That way you make a connection.
When using API Mode, there's no option to see the QR or get the number code.
122 days ago(+1)
HS just sends playback events to Connect & Control with your POVR username. It's up to Connect & Control to pass that along to the FeelConnect app, and have it control your device. If it's not working, POVR support forums or Connect & Control would be the best place to ask for help.