This is a statement that Centrify is aware that multiple concurrent logons for one account is possible. There are only settings to change the timeout of a session, not to limit the number that can be opened on each account
Question: Does Centrify have a setting that limits the number of logons that a certain user can have?
Answer: Centrify does not have a setting that limits the amount of logons that a certain user can have, just an idle timeout. Centrify is aware of this and may fix this issue in a future release.