Managing personal Outlook.com account settings, security, and privacy
I have exactly the same problem "Something went wrong.."
Up until a couple of weeks ago I was able to access Outlook.com from any of my three browsers - Edge, Firefox and Chrome. Now I can't access Outlook from any of them, and haven't been able to for the last couple of weeks, despite trying many times (so it can't be a "server down" problem), and despite trying all the suggestions that have been made (https, clearing cache, history, etc).
Something changed a couple of weeks ago, and because the problem exists on all 3 browsers, is obviously not the browsers.
Can Microsoft please sort this out?
It appears that there are a lot of people affected by the problem.