CodePudding user response：

You can fetch the current values with --method get, convert it to and ArrayList and then add your new value:

$appdata = az rest  --method get --uri 'https://graph.microsoft.com/v1.0/applications/{id}' | ConvertFrom-Json
$uris = [System.Collections.ArrayList]$appdata.web.redirectUris
$uris.Add('abc')