Microsoft has posted a service advisory related to this issue on their status page, https://azure.microsoft.com/en-us/status/
"Customers may experience intermittent connectivity issues with Azure and other Microsoft services (including M365, Dynamics, DevOps, etc). Engineers are investigating DNS resolution issues affecting network connectivity. Connectivity issues are resulting in downstream impact to Compute, Storage, and Database services, and some customers may be unable to file support requests. More information will be provided as it becomes available.
This message was last updated at 21:20 UTC on 02 May 2019"