There seems to be a small issue: a space behind an e-mail address causes invitation to fail (i.e. "you added 0 persons"). This happens when I pick a prediction suggested by my keyboard (Android) which remembers e-mail addresses but it puts also a training space.
It is tricky and I have got caught several times and thought that invitations did not work.
Please remove all leading or trailing whitespace characters from all concerned input fields, especially in mobile clients.
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