Hi Reynaldo,
I have been having the same issue over the past 4 days now as well.
Everytime I click on the "Sync mail" I am seeing the following message "Unable to load settings. Please try again later".
Would you please advise?
Thank you and regards.
Unfortunately it sounds like there is nothing you can do but wait and see if Microsoft ever fixes it.
And when they do who knows if you will be able to change your password but it definitely sounds like you will NOT be able to add any new accounts to "Sync mail" in Outlook and will instead have to switch to the Windows 10 Mail App and add another account there. And who knows if you'll ever be able to delete a connected account IF they fix it.
So essentially to me it appears as though Microsoft wants Outlook.com to simply work only for a single @outlook.com email address, nothing more in the future.