Here's a helper function I use:

def mount_blob_storage(blob_uri: str, secret: str, mnt_point: str) -> str:
    """ Mount Azure Blob onto databricks.
  
    References: 
    - Mounting blob storage: https://docs.databricks.com/data/data-sources/azure/azure-storage.html
 
    Parameters
    -----------
      blob_uri: str
          uri to blob storage container
      secret: str
          blob secret key for access
      mnt_point: str
          mount point in case do not want to use name of container
 
    Return
    --------
      mnt: str
          path to mounted storage in Databricks File System
  """
    
    # Get container and account
    container, account = get_storage_account_container(blob_uri)
    
    # Define mount point
       mnt = "/mnt/{}".format(mnt_point)
    
    dbutils.fs.mount(
      source = blob_uri,
      mount_point = mnt,
      extra_configs = {
        "fs.azure.account.key.{}.blob.core.windows.net".format(account): 
        secret
  })
        
    return mnt

While the reference points to instructions to mount a blob storage account, the same method should work for ADLS.