Issue Summary

Trying to add already existing users to a Customer Organization results in No option.

Steps to Reproduce

1. Make sure that a user (JSM customer) is present in your org.
2. Navigate to https://<your-site>.atlassian.net/jira/settings/products/servicedesk/organizations/ and select one organization
3. Select 'Add customers', then a modal opens up, so search for the existing user in your org by their email address
4. It shows the customer's email address momentarily, but it will show No option.

Expected Results

1. It should show the customer's email address as long as the user being added is in the org.

Workaround

1. Immediately after entering customer's email address on the modal, hit enter.
2. Select [Add customers] button.