As described elsewhere, scopes in gwrucio are used to describe the observing epoch (e.g., ER9, O2, postO2, etc) data is aquired from. Scopes must be created prior to any data registered to that scope.
To create the ER9 scope:
$ rucio-admin scope add --account root --scope ER9 Added new scope to account: ER9-root
So scopes are associated with user accounts. Here, we are using the rucio root account.