Hello there,
LAPS UI should be run as an administrator.
An image might help the community in understanding the exact tab.
Did you grant the computer objects permission of self to update that field?
Does the account you are using have permission to view objects that have the confidential bit set?
Something similar here might help https://social.technet.microsoft.com/Forums/en-US/2e75ce44-8b68-40c2-9907-1964ce86a962/laps-not-showing-password?forum=winserversecurity
Hope this resolves your Query !!
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