According to many articles basic authentication has been deprecated for several services.
https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basi...
https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-
authentication-deprecation-in-exchange-online-september/ba-p/3609437
Does this include SharePoint Online Active Authentication (SPOIDCRL cookie authentication), which requires sending the user/password in the Authorization header to the MSO endpoint?
SharePoint Developer Support Team Blog (rssing.com)
