Get Azure Active Directoy Tenant ID and Subscription ID
Install the Azure PowerShell
Get Tenant and Subscription Details during Login
To get your Tenant ID / Name and Subscription ID / Name you have several options with PowerShell, one option is using
which directly gives you your default Subscription Name as well as your default Tenant ID after logging in.
Get Tenant and Subscription details from the Context
Another option is using
which gets the metadata used to authenticate Azure Resource Manager requests.
Some more details you get with
which gets tenants that are authorized for your current user.