Cannot add Petr Kotas as reviewer on gerrit

I get this error: Petr Kotas <pkotas(a)redhat.com&gt; does not identify a registered user or group And he has 2 identical addresses when gerrit try to complete the name. It is likely that Petr logged in twice from different email addresses (e..g @redhat, @gmail) and the system created 2 accounts. In the past this required merging the duplicate accounts in the database. Can you check this? Nir