title: After enabling Cost Allocation Tags they don't appear in cost explorer
body: <p>I have had some EC2 instances running for many months but recently I started using AWS Cost Explorer. The instances already had tags on them i.e. "Env", "AppName". After I activated these tags in the Cost Allocation Tags section I still dont see them in the Cost Explorer filters. How long does it take for them to show up in the cost explorer filters or am I doing something wrong? I know for linked accounts it takes up to 7 days but this is not a linked account it is the actual account with my instances in it. </p>