The links above are VRChat APIs that are used to retrieve information on moderation or moderated actions on your vrchat account. As such you need to be logged into VRChat's website before they can be accessed. However, in order for the API link to work you have to be authenticated with the same domain. If you have logged in to vrchat from https://vrchat.com/home/login you can use the API link https://vrchat.com/api/1/auth/user/notifications?n=100 Likewise if you logged in to vrchat from https://www.vrchat.com/home/login you can use the API link https://www.vrchat.com/api/1/auth/user/notifications?n=100 The APIs check for your login session via browser cookies, so make sure your browser security settings isnt blocking them.