You didn't really describe what you did or were trying to do, so I'm going to guess... You wanted to send a link to your activity to yourself over e-mail? If you are trying to use the Share button on the activity details page? If that doesn't work, you can simply copy/paste the URL to your activity into an e-mail and be done with it. That way if you don't get the e-mail, you know the problem is not with Garmin Connect.