As you Intune administration was first released with his own portal (known as Silverlight portal), then has been integrated to the Azure administration portal and now Intune/Endpoint Configuration manager is moving away from the Azure portal.
After the released of the new Endpoint Configuration Manager portal URL (https://endpoint.microsoft.com/) this move was expected.
Starting August 1st, 2020 the Endpoint Configuration Manager portal will no longer be available from the Azure portal.
Start taking the habit to access https://endpoint.microsoft.com/ for managing Intune/Endpoint Configuration Manager.
You also have to update any automation in place within the Azure portal to use the https://endpoint.microsoft.com/ URL; this does not affect Graph API’s