ERROR: Usage error: To create role assignments, specify both --role and --scopes.

[A-J-A]

Hi,
I'm trying to follow the youtube series,
I can this error when running CreateDevopsSP.ps1 in Azure Cloud Shell

ERROR: Usage error: To create role assignments, specify both --role and --scopes.

Select a region to deploy to by number: 10
Selecting region 10. uksouth
PS /home/alex>
PS /home/alex> #adjust the vars to your needs!
PS /home/alex> $SPName = 'myDevopsSP' #your value here!
PS /home/alex> $keyvaultnamePrefix = 'kv-avdPoc' #leave this as is - (otherwhise you would need to change this in the pipeline variable file consistently)
PS /home/alex> $rgForSharedResources = 'rg-avdPoC-shared' #leave this as is - (otherwhise you would need to change this in the pipeline variable file consistently)
PS /home/alex>
PS /home/alex>
PS /home/alex> # create Service Principal (it needs to be owner to set permissions on azure artefacts - especially the application group users)
PS /home/alex> $sp = az ad sp create-for-rbac -n "$SPName" --role 'owner'
ERROR: Usage error: To create role assignments, specify both --role and --scopes.
PS /home/alex>
PS /home/alex> # this role is needed for the service principal to upload files to an azure storage account using azure devops.
PS /home/alex> az role assignment create --assignee "$($($sp | ConvertFrom-Json).appId)" --role 'Storage Blob Data Contributor'
argument --assignee: expected one argument