Just to confirm, does the group already exist in the Roles and Users section or you're trying to use it to add a new user with specific roles assigned?
The cmdlet is about assigning roles to Users / Groups added, though I see that it doesn't seem to find my test group either when added already, that part let me confirm on, but can you please confirm if you're trying to add a role to an existing user / group or add a new entry in the Roles / Users section.
David Domask | Product Management: Principal Analyst
PS C:\Users\Administrator> Get-VBRUserRoleAssignment
Role Type Name Id
---- ---- ---- --
BackupAdmin Group BUILTIN\Administrators 580df2ce-6666-4750-a7b8-b3c93a77f461
BackupOperator User HV-B\Administrator e8bf9c28-3304-4ce9-99ff-4ed56fd28c66
BackupOperator Group HV-B\testnospace b4fe38fd-9c60-458c-86f1-2290085b158
PS C:\Users\Administrator>
Apologies, this indeed had fallen off my radar -- checking internally, it is indeed a bug and target release for fix is 13.1, which we expect in upcoming weeks.
David Domask | Product Management: Principal Analyst
PS C:\Users\Administrator> Get-VBRUserRoleAssignment
RoleEntity : Backup Administrator
Role : BackupAdmin
Type : Group
Name : BUILTIN\Administrators
Id : 580df2ce-6666-4750-a7b8-b3c93a77f461
RoleEntity : Backup Operator
Role : BackupOperator
Type : User
Name : HV-B\Administrator
Id : e8bf9c28-3304-4ce9-99ff-4ed56fd28c66
PS C:\Users\Administrator>
PS C:\Users\Administrator> net localgroup testnospace
Alias name testnospace
Comment
Members
-------------------------------------------------------------------------------
The command completed successfully.
PS C:\Users\Administrator> Add-VBRUserRoleAssignment -Name testnospace -Role BackupOperator
RoleEntity : Backup Operator
Role : BackupOperator
Type : Group
Name : HV-B\testnospace
Id : b61ee8c2-7b06-4410-88a5-3b31a6d69e07
PS C:\Users\Administrator> Get-VBRUserRoleAssignment
RoleEntity : Backup Operator
Role : BackupOperator
Type : Group
Name : HV-B\testnospace
Id : b61ee8c2-7b06-4410-88a5-3b31a6d69e07
RoleEntity : Backup Administrator
Role : BackupAdmin
Type : Group
Name : BUILTIN\Administrators
Id : 580df2ce-6666-4750-a7b8-b3c93a77f461
RoleEntity : Backup Operator
Role : BackupOperator
Type : User
Name : HV-B\Administrator
Id : e8bf9c28-3304-4ce9-99ff-4ed56fd28c66