I recently upgraded my ArcGIS Enterprise and lost access to a few deprecated story maps. I was able to recreate the apps, but realized that any users who had bookmarked the original app would not be aware. I tried using the ArcGIS Assistant but was not able to make it work. I reached out to technical support and they suggested I reach out to my IT department and implement a redirect on my server.
It would be ideal if there was a way for the average Portal user to update/reassign URLs directly within Portal.