I'm using the latest Fiddler version and O365 extension, but I'm still unable to get through the authentication process when using Oauth. I've been trying with EWS editor, and both Oauth and basic fail. Outlook fails to connect to an Exchange Online mailbox. Using Chrome and IE can't get to outlook on the web, or google.com for that matter. It seems to be having a problem with SSL, but I'm not clear on that.
EWS editor error using basic:
Exception details: Message: The request failed. The underlying connection was closed: An unexpected error occurred on a send.
EWS editor error using Oauth:
Message: One or more errors occurred.