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When users set up sync with an iCloud account for the first time, a pop-up “Look me up by email” asks for the user’s confirmation: If you enable, the user name shows on the vault sync page, else(if you disable), an “Unknown user” displays.
iCloud website:
Disconnect the vault sync with iCloud in Enpass and reconnect it again. You should now see the iCloud account name under iCloud sync.