If you get an error that the Email Attachment Body is Null you may need to have a System Administrator check that you don't have High assurance session required for exporting and printing reports. Since report sender is authenticating as a user, it is unable to handle the additional security verification and therefore cannot generate the report data.

Disable the High assurance session required option in order to be able to use Report Sender. This is under the Identity Verification menu in Setup.

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