identity password

Cannot Change password in groovy script

Hello,
im trying to Change the Password of a user in a groovy script. I try to Change my own Password and im Administrator.
When i read the Password (before change) of the user object, Password ist empty.
Then i create an updateDescriptor and set new firstname and new Password and i update the user with this descriptor. After updateUser new firstname ist correct but Password is empty.

When i take a look in the updateDescriptor string representation (see below) everything seems ok. But the user Password is not updated.

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