Hi,
I would suggest you check if the user granted to view the password the the right permissions.
For example, you want to grant read password permissions to the members of AdmPwd group:
Set-AdmPwdReadPasswordPermission -OrgUnit Desktops -AllowedPrincipals AdmPwd
If the user has the right permission , you can also check the steps in the following link:
http://woshub.com/manage-local-administrator-passwords-with-laps/
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Best Regards,