CSV Upload - Subtask Assignees not being uploaded


My CSV file is uploading fine. The dates, name, section/column, subtasks are all uploading fine. The only thing missing is that the assignees of subtasks are not showing. The assignees of parent tasks show just fine.

When I do the upload, on the make changes page it shows subtasks assignees and it all looks correct. Once I click go to project, that’s when all the assignees disappear.

Please help!