Please add the ability to add users from ArcGIS Online (AGO) to groups in ArcGIS Enterprise (AGE). During a recent natural disaster it would have expedited collaboration with other agencies to simply be able to add their users to our groups in AGE. Instead, I had to publish content to AGE, then enable sync on the content, then use distributed collaboration to push the data to AGO, and then finally share that with other agencies.
Another example is we have Image Server for AGE but not AGO. I was having to share rasters to AGO in layer packages for other agencies to download and use because while I could add the image service URL to a group in AGO the users in AGO would still not have permission to access the service because it is not shared with everyone.