DelegatedAdminRelationship.ReadWrite.All

const options = {
	authProvider,
};

const client = Client.init(options);

const delegatedAdminAccessAssignment = {
  accessContainer: {
    accessContainerId: '869713c9-0b28-4d08-8949-ae07ae1bf528',
    accessContainerType: 'securityGroup'
  },
  accessDetails: {
    unifiedRoles: [
      {
        roleDefinitionId: '29232cdf-9323-42fd-ade2-1d097af3e4de'
      },
      {
        roleDefinitionId: 'f2ef992c-3afb-46b9-b7cf-a126ee74c451'
      },
      {
        roleDefinitionId: '729827e3-9c14-49f7-bb1b-9608f156bbb8'
      },
      {
        roleDefinitionId: '3a2c62db-5318-420d-8d74-23affee5d9d5'
      }
    ]
  }
};

await client.api('/tenantRelationships/delegatedAdminRelationships/72a7ae7e-4887-4e34-9755-2e1e9b26b943-63f017cb-9e0d-4f14-94bd-4871902b3409/accessAssignments')
	.post(delegatedAdminAccessAssignment);

Import-Module Microsoft.Graph.Identity.Partner

$params = @{
	accessContainer = @{
		accessContainerId = "869713c9-0b28-4d08-8949-ae07ae1bf528"
		accessContainerType = "securityGroup"
	}
	accessDetails = @{
		unifiedRoles = @(
			@{
				roleDefinitionId = "29232cdf-9323-42fd-ade2-1d097af3e4de"
			}
			@{
				roleDefinitionId = "f2ef992c-3afb-46b9-b7cf-a126ee74c451"
			}
			@{
				roleDefinitionId = "729827e3-9c14-49f7-bb1b-9608f156bbb8"
			}
			@{
				roleDefinitionId = "3a2c62db-5318-420d-8d74-23affee5d9d5"
			}
		)
	}
}

New-MgTenantRelationshipDelegatedAdminRelationshipAccessAssignment -DelegatedAdminRelationshipId $delegatedAdminRelationshipId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.models.delegated_admin_access_assignment import DelegatedAdminAccessAssignment
from msgraph.generated.models.delegated_admin_access_container import DelegatedAdminAccessContainer
from msgraph.generated.models.delegated_admin_access_container_type import DelegatedAdminAccessContainerType
from msgraph.generated.models.delegated_admin_access_details import DelegatedAdminAccessDetails
from msgraph.generated.models.unified_role import UnifiedRole
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = DelegatedAdminAccessAssignment(
	access_container = DelegatedAdminAccessContainer(
		access_container_id = "869713c9-0b28-4d08-8949-ae07ae1bf528",
		access_container_type = DelegatedAdminAccessContainerType.SecurityGroup,
	),
	access_details = DelegatedAdminAccessDetails(
		unified_roles = [
			UnifiedRole(
				role_definition_id = "29232cdf-9323-42fd-ade2-1d097af3e4de",
			),
			UnifiedRole(
				role_definition_id = "f2ef992c-3afb-46b9-b7cf-a126ee74c451",
			),
			UnifiedRole(
				role_definition_id = "729827e3-9c14-49f7-bb1b-9608f156bbb8",
			),
			UnifiedRole(
				role_definition_id = "3a2c62db-5318-420d-8d74-23affee5d9d5",
			),
		],
	),
)

result = await graph_client.tenant_relationships.delegated_admin_relationships.by_delegated_admin_relationship_id('delegatedAdminRelationship-id').access_assignments.post(request_body)