A TLS 1.0 fallback was able to handshake with the server, but we no longer accept TLS 1.0 fallbacks. The server needs to be updated to correctly implement version negotiation and preferably support TLS 1.2.
I've used every browser I have (Chrome, Firefox, Safari, IE - all current versions). I was in yesterday and had no trouble. Now I can't crate a new StoryMap due to this error when I logon.