> Regression and troubleshooting for below point 
- Email testing
- Add Approval Request Tab In Task Detail - Design & Implement the API
- Display the task number in the board list & detail page
- Restrict all activity if task status is closed
-  If due date request rejected, not showing name of “date extension approver” name  in all activity
- Estimated time > If task creator edit task and untick the estimated time from task setting, still task owner able to see start timer button in task
- Add the Status Filter in Filter page

Observe issue while email testing on dev 
issue 1:- Priority > Only first character should capital not full word 
issue 2:- Comment added > Time zone issue 
issue 3:- Task Completion Approval Request email > showing Action At date and time in due date field

Issue 1:- Task detailed > Change due date > time selector not display for todays date
Issue 2:- Approval Request tab > Indexing issue if creator rejected the task closer request 
Issue 3:- Status Filter in Filter page > Not showing any data, if selected "Completed" status