When you enter an e-mail address and click on Add, it is queued at the bottom.
Until you click Create Share, the invite will not be sent.
You can enter additional e-mail addresses to send the same invitation but if the e-mail address you are trying to add is a duplicate of what was already added, you will get Error 1653.
Check the list of e-mail addresses (listed just above Your display name) to make sure there are no duplicates.
