Just had to restore a snapshot and could not get the frontend to come up.
Searched the forum but none of the answers had the correct syntax.
First you want to list the snapshots you have
hassio snapshots list
That will give you a list of the snapshots you have on your system
The key was not using the name but the slug
copy the slug name with the “” from the list and use it below in
place of my slug name “b9886fa2”
hassio snapshots restore -name “b9886fa2”
Wait for the system to restart and all should be good
Hope this helps someone.