Check Azure Container Registry Name

Validate-ACRName.ps1

# Check if the name myRegistry can be used for a new Azure Registry Container.
# More info: https://docs.microsoft.com/en-us/rest/api/containerregistry/registries/checknameavailability

#region variables
$ACRName = 'myRegistry'
$ResourceType = 'Microsoft.ContainerRegistry/registries'
#endregion


#region Get AccessToken
$Context = Get-AzContext
$azureProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
$profileClient = New-Object -TypeName Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient -ArgumentList ($azureProfile)
$token = $profileClient.AcquireAccessToken($Context.Subscription.TenantId)
#endregion

#region Validate ACR Name
$uri = ('https://management.azure.com/subscriptions/{0}/providers/{1}/checkNameAvailability?api-version=2019-05-01' -f $($Context.Subscription.id), $($ResourceType.Split('/')[0]))

$params = @{
    'Uri' = $uri
    'ContentType' = 'application/json'
    'Headers'     = @{
        'authorization' = "Bearer $($Token.AccessToken)"
     }
    'Method' = 'POST'
    'Body' = @{
        'name' = $ACRName
        'type' = $ResourceType
      } | ConvertTo-Json

}

Invoke-RestMethod @params
#endregion