I get "We were unfortunately unable to place the cookie that is necessary for the use of our site. Is your computer connected to the internet through a company network? We recommend that you ask your IT department for an exception for DER SPIEGEL content. Have you configured a browser extension or the browser itself such that cookies are blocked? Please add DER SPIEGEL to your list of exceptions. Should you continue to have problems, you can find more information here."

I only have ublock origin and a minimum of config changes.

Weird that didn't work for me.. FF + uBlock Origin. They have a really nasty paywall that checks if they can actually place a cookie.

Thankfully nathan_phoenix' archive.is link worked great.