Bug 1885229

1. Proposed title of this feature request  
Detect Microsoft 365 non-worldwide cloud endpoints
  
3. What is the nature and description of the request?
Currently, Evolution's OAuth support for Microsoft 365 is hard-coded to look at only one endpoint (outlook.office365.com). Certain other cloud tenancies for Microsoft 365 have other endpoints that a customer might need to access (see https://docs.microsoft.com/en-us/microsoft-365/enterprise/microsoft-365-endpoints?view=o365-worldwide).
  
4. Why does the customer need this? (List the business requirements here)
Customer is a consumer of the US Goverment GCC High endpoint and requires e-mails to be digitally signed and/or encrypted in order to comply with DoD regulations. Microsoft 365 users cannot send signed or encrypted e-mail using the Outlook Web App in a web browser under Linux. Also note that Microsoft 365 GCC High does not support IMAP. The only option for signed/encrypted email under Red Hat Enterprise Linux is to use Evolution to connect to Microsoft 365 GCC High.  
  
5. How would the customer like to achieve this? (List the functional requirements here)
Customer would like functionality to be implemented to be able to use the OAuth backend for Microsoft 365 with non-worldwide cloud endpoints, either through manual selection or automatic detection.
  
6. For each functional requirement listed, specify how Red Hat and the customer can test to confirm the requirement is successfully implemented.  
Evolution can successfully configure an email/calendar Office365 account using the US Government GCC High endpoint (outlook.office365.us).
  
7. Is there already an existing RFE upstream or in Red Hat Bugzilla?  
This RFE was filed upstream at <https://gitlab.gnome.org/GNOME/evolution-ews/-/issues/121>.
  
9. Is the sales team involved in this request and do they have any additional input? 
Sales is not involved.
  
10. List any affected packages or components.  
evolution