With the introduction earlier in July of Microsoft Entra to centralize all identity and access management capabilities, starting December 2022 access to Azure AD from the Office 365 administration portal will redirect to the Entra portal (https://entra.microsoft.com).
The rollout of this redirection is expected to be completed by March 2023.
Off course you can still continue to access the Azure AD portal using its URL https://aad.portal.azure.com/; while nothing has been announced yet but you can expect that at some point of time, the Azure AD portal will also be redirected to Entra.
If you are using a firewall to control Internet access from your corporate network, you may need to update your rules to allow *.entra.microsoft.com
