I fixed the URL, thanks, my bad on the original post. I also have a Chase Sapphire Preferred. I never get that page, I only get the error message I mentioned above.

When I call the benefits line they're able to start a claim for me and send me a form to fill in via email, but I can never get the web version to work and the phone reps are completely unable to comprehend the problem, let alone attempt to fix it

Neil