Hey Gareth,
I've tried to access on my Macbook Pro (13-inch, 2017 Two Thunderbolt 3 ports), My iMac (iMac (Retina 5K, 27-inch, Late 2014), and my iPhone (XR 128 gb). I'm experiencing the same issue on all devices.
Yes, I've tried accessing via a web browser (Chrome & Safari) but I have the same problem.
Yes, I used to be able to log in before without any issues.
Thanks
Tea