For Windows virtual machines deployed into Azure using marketplace images you may have created rules in your NSG or firewalls to allow the server to communicate the Azure KMS activation service. This used to be kms.core.windows.net and had an IP address of 23.102.135.246. As of March 2023 Microsoft has moved to a new address azkms.core.windows.net and has two IP addresses "20.118.99.224" and "40.83.235.53". The existing address kms.core.windows.net is pointed to the new IP of 40.83.235.53.
So if your servers are having issues with activation please check your rules to ensure they have the new IP addresses and you can resolve the old and new domain names (azkms.core.windows.net, kms.core.windows.net)
