**Subscription** is a billing and security boundary in Azure.
Subscription is associated **with a single** Entra ID directory. Multiple subscription can trust the same directory, but single subscription can trust only ***one directory***.
### See also
1. [[Microsoft Entra ID]]
### Reference
1. [AZ-104: Manage identities and governance in Azure](https://learn.microsoft.com/en-us/training/paths/az-104-manage-identities-governance/)