Hi Suneel,
Few questions :
1. First userid with which you are approving timesheet (manager user id) and userid with which you are creating timesheet. (EMployee user id). Are these both in same org structure ?
2. If above answer is true. Please ensure you are logging in with manager id to Fiori.
3. Also provide your sbwp screenshot and tile screenshot. and show Inspect element (F12 in browser) When you click on the tile.
Regards,
Tejas