How to Update Resource Tags in Azure?

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Add or Update Tags to Azure Subscription:

PowerShell Script: Add or update subscription tags with Merge Operations in Azure.

$NewTags = @{
 "BusinessArea"="";
 "ITTeam"="";
 "Solution"="";
 "ChargebackTo"="";
 "Environment"="";
}

Update-AzTag -ResourceId "/subscriptions/{_add_subid_}" \
-Tag $NewTags \
-Operation Merge

Add Tags to Multiple Resources in Azure:

PowerShell Script: With this script you can add tags to multiple resources by selecting a target resource group in Azure.

# Fill the variable details
$Subscription="_add_subscription_name_here_"
$RGName="_add_resource_group_name_here_"

# Add/Update Tag Name and Values
$tagApplicationName="_add_tag_value_";
$tagOperationsArea="_add_tag_value_";
$tagOwnerName="_add_tag_value_";
$tagOwnerEmail="_add_tag_value_";

Set-AzContext -SubscriptionName "$Subscription"
$RGs=Get-AzResourceGroup -Name "$RGName"
$Resources=Get-AzResource -ResourceGroupName $RGs.ResourceGroupName
foreach ($Resource in $Resources){
    $ResourceId = $Resource.ResourceId
    $ResourceName = $Resource.Name
    $mergedTags = @{
     ApplicationName="$tagApplicationName";
   	 OperationsArea="$tagOperationsArea";
     OwnerName="$tagOwnerName";
     OwnerEmail="$tagOwnerEmail";
    }
    Update-AzTag -ResourceId $ResourceId -Tag $mergedTags -Operation Merge
    Write-Output "Tags has been added successfully for the RG:$ResourceName `n"
}

Note: save the script file with .ps1 extension.