Below are some things you can try when dealing with an issue regarding Microsoft Classroom not updating attendance records for a student:

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1. Check the student’s profile settings are correctly configured.
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2. Ensure the student has correctly logged into the Classroom.
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3. Identify any technical issues that may be disrupting the student’s connection to the classroom.
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4. Check the internet connection.
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5. Check that the other students in the classroom are still showing on the attendance list.