Can you please check if the option to show bounding box is ON on your system?
In Illustrator open view menu and look for option “Show Bounding box” or “Hide Bounding Box”. If it says “Show Bounding box”, Select the option and check your workflow.
Hope this solves your problem.
An error occurred while saving the commentNitin kumar commented
when i'm using direct selection tool, corners box not showing. show edges is on, show bounding box is on but it can't help. I'm attaching an image. please see the image and help. thank you