Cannot copy field data from user-select field to text field

[Becky]

My group recently migrated from Jira server to Jira cloud.  

In Jira server we have a workflow post-function that copied information from a custom user-select field to a custom text field.  When the post-function was triggered, it carried over the user's name (e.g., user-select field said 'Sherlock Holmes' -> text field said 'Sherlock Holmes').  This same post-function in the cloud copies over an account ID number, which is not readable to humans or useful for reporting in dashboards.

Has anyone run into this problem and found a way to copy over a user's name from a user-select field instead of pulling over their ID number?

[Dexter de Vera]

Use Jira Automation instead. 

Create Automation

Add a trigger - Issue Transitioned

then set the status from and to (ei. Inprogress to Done)

Add an action - Edit issue

Select the field you want to update (ei. Description) then input this Smart value - {{issue.TheFieldYouWantToCopy.DisplayName}}

ei. {{issue.UserPickerField.DisplayName}}

Then turn on the Automation rule.