While Outlook is running, click the CTRL key and then right-click the Outlook icon in the system tray, select “ Test Email Autoconfiguration”.ī.
Does the issue only occur to a particular user? Or all users are affected?.From the 2nd link you shared above, seems like you have already tried adding the registry key 'ExcludeExplicitO365Endpoint' with no luck, right? If this is the case, could you provide the following information so that we can understand better about the situation?
