Is there any update on this planned change to allow oAuth? I just received notice from our organization that they are going to disable Basic Authentication at the end of May, 2021. Even if Microsoft and Google extend their deadlines, I'm sure there are other organizations, like mine, that are trying to stay of the stated deadlines.
Microsoft has announced plans to disable Basic Authentication for Exchange Online for all tenants in 2021. To prepare for this change, [omitted] will require modern authentication for ALL applications, including those previously granted exceptions, by May 31, 2021.
Your application must use modern authentication to connect to Exchange Online by June 1, 2021, or it will no longer work.