Problem with adding a tag

Im in day 12 , I know there might be a silly mistake but , i added tag environment : dev thru azure portal but it says error:tag not created (or smth). what did i miss

I don’t see the “Save” button in the bottom of your screen, but you need to click that. In general, the key name of an environment variable is case insensitive, but I believe that the case is preserved from when you apply it. It may be true that our grader cares about case, so you should enter it as “Environment” just to make sure it validates.