Good afternoon, @lyao ...
I completely agree with @KristinL on this one. Assuming that your school has the Edpuzzle LTI external app integrated with your school's Canvas environment, the "Test Student" role wouldn't work. The reason for this is that "Test Student" doesn't technically have an e-mail address assigned to it. Many LTIs that are integrated with Canvas need an e-mail address from a Canvas account in order to authenticate into the third-party LTI tool. Since the "Test Student" role doesn't have this, then you would be seeing a screen like what you've shared with us. A work-around would be to request a "dummy" student account from your school's local Canvas administrator or from someone in your school's Online Learning/eLearning department. They might be able to set this up for you so you can do further testing.
I hope this extra bit of info will be helpful to you. Take care, and be well.
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