Your Ad Account can get disconnected from the Paragone platform for various reasons, from your password changing to token issues or simple disconnects. In that case, there's a very simple fix!
Go to your profile page on the platform, and choose the Ad Account part, and select the Add an Ad Account button:
Once you do, it will open a pop up with the Ad Accounts available to you:
Simply choose the one(s) you need and Link to Paragone!