If you’re using it at work, it may be getting blocked via policies or an overzealous endpoint protection application. Can you check with your IT if any URLs are being blocked or filtered for it?
When you’re at the login page, can you right click the background and inspect element, then open the Network tab. Type your login details in and look out for anything that comes up red or with statuses as 401, 402, 403 or 500 and pass those across to your IT and in here?
(You may get 524 statuses on icons, you can ignore these ones)