Custom content of the required validation for tileGroup

Is there specific key of required validation for tileGroup?
Example for checkbox: iew.validator.required.checkbox

No, there is not.

You can overwrite default validation messages for required validation for components:

  • text field: iew.validator.required.text.field
  • checkbox: iew.validator.required.checkbox
  • combobox: iew.validator.required.combobox