How to assigned permissions for user-assigned managed identity on multiple subscriptions in bulk

First get the subscriptions you want to assign permissions on:

$subs = Get-AzSubscription |? { $_.Name.Contains("NorthAmerica") }

Then get the client id of the identity you to assign permissions for:

$id = Get-AzUserAssignedIdentity -ResourceGroupName my-shared-prod-westus2 `
                                 -Name my-shared-prod-westus2-id

Now perform the actual permissions assignment:

$subs |% { New-AzRoleAssignment -Scope "/subscriptions/$($_.Id)" `
                                -RoleDefinitionName "Contributor" `
                                -ApplicationId $id.ClientId }

That’s it, folks!

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