From status2.azure.com:
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InformationAzure DNS - Investigating
We are currently investigating reports of an issue affecting Azure DNS. More information will be provided as it is known.
This message was last updated at 21:59 UTC on 01 April 2021
----------------- WarningDNS issues - Investigating
Engineering is investigating an issue with DNS that is impacting several downstream Azure services.
This message was last updated at 22:07 UTC on 01 April 2021