With the release of BLXbox 2.0.4, you will need to sign up to the Xbox One API service.
https://xboxapi.com/
Once you sign up you can pick your subscription level. There is a free subscription but it only gives you 120 API calls an hour. The plugin will use quite a few calls to get all of the information for all of your friends.
When you sign up and link your XBOX account to it you will be given an XboxAPI API Key which you will need to enter when you add a gamertag in the plugin.
https://xboxapi.com/
Once you sign up you can pick your subscription level. There is a free subscription but it only gives you 120 API calls an hour. The plugin will use quite a few calls to get all of the information for all of your friends.
When you sign up and link your XBOX account to it you will be given an XboxAPI API Key which you will need to enter when you add a gamertag in the plugin.