Sure thing! So, if you're looking to set up your data block cluster access mode to a single user and want that user to be a service principal account, you've got a couple of steps ahead. First, create your single-mode cluster. Once that's done, you'll need to assign the service principal account to it. This involves configuring the necessary permissions and access rights for that service principal. After the setup, you should be able to access the cluster using only the service principal account you've designated. It's all about fine-tuning those permissions to ensure that only the right folks (or, in this case, service principals) can get in. Double-check your configurations, and you should be good to go!
Best regards, Zpakerman