Hi @Mariana Rato
I suggest you post a new thread in Microsoft Tech Community:
https://techcommunity.microsoft.com/t5/onedrive-developer/bd-p/OneDriveDeveloper
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Via searching online, I find 2 similar threads:
The answer seems to be: No, you need an app registration.
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