SUMMIT BUTTON not functioning

The submit button displayed on the questions is not working. I have completed Kali Linux fundamentals, but couldn’t receive my certificate because the submit buttons on the question pages are deactivated. Can the customer service or support a
Activate it, please?

Do you by chance have a screen shot of the deactivated buttons? I just checked and Submit works for me.

Note the submit button is greyed out if you have not given an answer to every question.