Unable to modify one user attribute

Document ID : KB000107724
Last Modified Date : 24/07/2018
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Issue:
We are unable to modify one attribute in a Modify User type task.  All other attributes can be modified.  The attribute is not designated Read Only in the user store.
Resolution:
In the profile screen of the task, edit the attribute and change Permission from Read Only to Read/Write, and also change Style from String to Text.