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)
You may also have to add the following domains to your Global Allow List as well
For geolocation purposes, the domain outlook.com is recommended to be added as Microsoft has numerous subdomains utilized (https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges).
When using Office365 Hybrid mode, outlook.com must be on the internal domains list as well as on the allow list if you are blocking technology or mail categories. When activating forwarding to Umbrella, if SMTP errors ensue, ensure the relay server is routing out of the right connector.
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/