Hello, @David Kim !
Can Azure Dedicated Hosts be shared across subscriptions?
Azure Dedicated Hosts are assigned to one Azure subscription:
https://learn.microsoft.com/en-us/azure/virtual-machines/dedicated-hosts
Azure Dedicated Host is a service that provides physical servers able to host one or more virtual machines assigned to one Azure subscription. Dedicated hosts are the same physical servers used in our data centers, provided instead as a directly accessible hardware resource.
While it doesn't explicitly state in the documentation that other subscriptions within the same tenant cannot access dedicated hosts, this is more clearly stated in the Microsoft video, An introduction to Azure Dedicated Hosts:
https://www.youtube.com/watch?v=5qegfWl5woo
Ziv Rafalovich joins Donovan Brown to introduce Azure Dedicated Host, which is a service that provides physical servers - able to host one or more virtual machines - dedicated to one Azure subscription.