How to Connect Two Azure Virtual Network Gateways in Different Azure Directories

It looks like I over complicated what I need to do as I could just setup a network peering between two separate Azure Directory Tenets using PowerShell.

Although the Azure Portal does allow network peering within the same Azure Directory Tenant it does not show an option to setup a network peering between two networks in separate Tenants. Below is the Powershell script I used to achieve this:

## Peer AzureUK to AzureUS
## Selecting the UK Subscription where the domain controllers virtual network resides.

Set-AzContext -SubscriptionId "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx"

## Select the UK Virtual Network and the Resource Group containing the domain controllers
$vNetA=Get-AzVirtualNetwork -Name Azure.yourdomain.com -vnet -ResourceGroupName Azure.yourdomain.com
Add-AzVirtualNetworkPeering `

## Specify the name of the Peering as seen from the UK directory tenant.

-Name 'AzureUK-to-AzureUS-Peering' `
-VirtualNetwork $vNetA `

## Specify the Resource ID of the remote virtual network within the US directory tenant.

-RemoteVirtualNetworkId "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx/resourceGroups/Networks/providers/Microsoft.Network/virtualNetworks/PulicNetworks"

 

## Peer AzureUS to AzureUK

## The selecting the US Subscription which contains the virtual network you would like to work with.

Set-AzContext -SubscriptionId "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx"

## Select the US Virtual Network and the Resource Group which you would like linking to grant access to the UK domain controller network.
$vNetA=Get-AzVirtualNetwork -Name PublicNetworks -ResourceGroupName PublicNetworks
Add-AzVirtualNetworkPeering `

## Specify the name of the Peering as seen from the US directory tenant
-Name 'AzureUS-to-AzureUK-Peering' `
-VirtualNetwork $vNetA `

## Specify the Resource ID of the remote virtual network within the UK directory tenant.
-RemoteVirtualNetworkId "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx/resourceGroups/Azure.yourdomain.com/providers/Microsoft.Network/virtualNetworks/Azure.yourdomain.com-vnet"

https://docs.microsoft.com/en-gb/azure/virtual-network/create-peering-different-subscriptions#cli