You don't want to manually enable auto invoice for each tenant. Instead, email firstname.lastname@example.org and ask to enable auto invoice for all tenants, and then you can disable auto invoice for specific tenants.
This can be done on the centralized lease page of each tenants. First click on Leases icon on the left sidebar menu of 6Storage dashboard.
On the leases data list, select the required tenant you wish to enable auto invoice. Click on the tenant name, which will redirect you to the tenant’s centralized main page.
Under Lease Information, you will find Auto Generate Invoice. Click to enable it.
Alternatively, you can disable auto invoice for multiple tenants.