Certain Microsoft applications require the use of Autodiscover domains to function properly. If you are having issues using Outlook, Office 365 or other Microsoft applications please make sure that you are allowing the following Autodiscover domains.
When using Microsoft Autodiscover, typically the DNS record for your Autodiscover domain will be a CNAME record to Microsoft's servers. To ensure uninterrupted Autodiscover capabilities, ensure that the following domains are not blocked on your network or are whitelisted by adding it to the Global Allow List:
outlook.com (Webmail - but may change)
autodiscover.outlook.com.glbdns.microsoft.com (Software/Technology, Business Services, Webmail - but may change)
For geolocation purposes, the domain outlook.com is recommended to be added as Microsoft has numerous subdomains utilized (https://support.office.com/en-gb/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2).
Using Autodiscover with Virtual Appliances
If you are seeing Autodiscover fail, you may need to add the Autodiscover address to the internal domains list as explained here: configuration on the Virtual Appliance. To do so, reference our guide at https://docs.umbrella.com/product/umbrella/6-local-dns-forwarding/
Using Autodiscover with Roaming Clients
When using Autodiscover with Roaming Clients, please ensure that your Autodiscover domain is added to the internal domains list as explained here: https://docs.umbrella.com/product/umbrella/appx-d-internal-domains/