ReportGarden doesn't automatically load your new accounts from Adwords. You can refresh the account to load the missing ones from Adwords. Here the steps to do so.
1. Navigate to Accounts page using the "Accounts" link in the left sidebar
2. You will see a list of accounts that have been linked. Please find your mcc account from this list and click on it
3. In this page you will see a list of accounts that are under your mcc.
4. Please click on the "Refresh Account" button on the top right corner of the page
5. If you have wait for 30-60 secs, the system will get all your accounts from Adwords and load them into ReportGarden.
Please give this a try and if you need any help drop us an email at firstname.lastname@example.org