To export report data, external users need “Export Reports” permission.
![](https://www.infallibletechie.com/wp-content/uploads/2021/09/How2Bto2Ballow2Bexternal2Busers2Bto2Bbe2Bable2Bto2Bexport2Breports2Bin2BSalesforce.jpg)
These permissions aren’t available to high-volume user licenses, such as Customer Community, High Volume Customer Portal, Service Cloud Portal, and Authenticated Website. Check the following link for addtiional Information.