You would need Time code as a dimension for this one. If you do not have the option to import Time code as a dimension, please check this community post on how to enable this:
If you have Time code as a dimension, you can use this formula to show Time code for each user based on issues with a start date:
NonEmptyString(Generate(
Filter(
[Time Code].[Time Code].Members,
[Time Code].CurrentMember.Name <> "(none)" AND
[Measures].[Issues with start_date] > 0),
[Time Code].CurrentMember.Name, ","
))
Please check the spelling for any custom field dimension and measure to avoid any typo problems. We suggest using autocomplete whenever you can when writing formulas.
Daina / support@eazybi.com