As announced in 2023, Office 365 services are moving under the cloud.microsoft umbrella domain (Office 365 – New unified domain for Office 365 services (hametbenoit.info)).
Since then, quite few services have been already moved under the cloud.microsoft domain (Office 365 – Transitioning to cloud.microsoft domain (hametbenoit.info), Office 365 – Continuous move to cloud.microsoft domain; new services moved (hametbenoit.info) and Office 365 – New services being moved under the cloud.microsoft umbrella (hametbenoit.info)).
Well, the Exchange Online administration portal is now also moving under the cloud.microsoft domain.
The current URL (https://admin.exchange.microsoft.com/) will remain available for some time and a redirection to the new URL (https://admin.cloud.microsoft/exchange) will be set in place.
Redirection will be in place by late October 2024 up to late December 2024.
As always, start communicating to your Exchange Online administrators to use the new URL and ensure the cloud.microsoft domain (and sub domains) are being authorized by your firewall if you are managing white/black list of URL’s/domains.