No assignment button in my notebook

I don’t have an assignment button in my notebook. I tried all the ways that were mentioned here:
"The first thing to check is that you have not renamed the assignment notebook and opened it only by clicking “Work in Browser” from the “Programming Assignment” page. If that’s not true, then that is the problem. You need to use the “standard” name of the assignment in order to submit.

If you have the standard name, then try “Kernel → Restart and Clear Output”. If that doesn’t work, then try closing the notebook and clicking “Work in Browser” again.

If none of that works, please let us know."

But it doesn’t still show me the assignment button. Can you please help me?

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I am facing the same problem