Hi @bharti_lala ...
I don't think you will be able to use the "Student View" to test out the Office 365 LTI external tool in your course. The reason for this is that I believe O365 is looking for an e-mail address to authenticate, but the "Student View" technical does not have an e-mail address associated with it. So, in order to test this out, you would need to have a dummy student account listed within your "People" page where you could sign in to your course with that account as a student to test out the integration. Your school's local Canvas administrator or someone from your school's Online Learning/eLearning department would be able to help you with this.
I hope this info will be of help to you. Sing out if you have any other questions...thanks! Take care, stay safe, and be well.
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