Assigning Roles to Kuberentes Cluster

[houliang428]

Hi. I created a Kubernetes Cluster and I want to assign the role "AcrPull" to it.
I tried similar codes with yours but encountered some problems.

IRoleAssignment roleAssignment2 = authenticated.RoleAssignments
                    .Define("Roles")
                    .ForObjectId(theCluster.Id)
                    .WithBuiltInRole(BuiltInRole.Contributor)
                    .WithScope(azureRegistry.Id)
                    .Create();

1. There's no role named AcrPull in the field of BuiltInRole. But I found this role is listed in the official document of RBAC BuiltInRole.

2. I tried with role contributor, but got
   The client 'xx' with object id 'yy' does not have authorization to perform action 'Microsoft.Authorization/roleAssignments/write' over scope '/subscriptions/d6622a0d-933b-4924-b2ff-ea141456872b/resourceGroups/myGroup/providers/Microsoft.ContainerRegistry/registries/MyRegistires/providers/Microsoft.Authorization/roleAssignments/Roles'.

Could you help me with the problems? Thank you very much!