Hi Scan Issue,
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According to my research, there is an official article that mentions possible issue occurs when setting up multifunction printer to send email, it also lists relative causes, you could check whether your scenario is mentioned there. Fix issues with printers, scanners, and LOB apps that send email using Microsoft 365 - Exchange | Microsoft Learn
If you have further concern, could you please offer me the error message when you set up the printer to send email?
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