Hello Hub Team,
It appears the new email report capability is only for "Premium" Hub users: https://www.esri.com/arcgis-blog/products/arcgis-hub/constituent-engagement/your-arcgis-hub-site-met...
I propose you implement this functionality for all Hub types. As an Hub designer for two organizations (with experience creating 4 hub sites), I've seen multiple perspectives. This is a very useful functionality for stakeholders and I believe you're missing a large audience of governments and smaller no-profits that can't afford/justify purchasing a "premium" hub.
Please consider this for a future release.
Thank you,
Amanda Huber