SageMaker Studio Notebooks can be shared between members (they will need to be authenticated) of the same Studio Domain in your AWS Account.
If you are assessing candidates, which need limited and AWS-unauthenticated access, I suggest you take a look at Amazon Sagemaker Studio Lab, which is a free simplified version of Amazon SageMaker Studio.
Your candidates could develop their Jupyter Notebooks in that environments and share the notebook file with you to open in your Amazon Sagemaker Studio environment.
Hope this helps you!
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