I think that you simply did not set the rights for your token and now you are getting an error that there are no read rights.
It was enough to google the error to understand it. There is a solution here:
https://stackoverflow.com/questions/63620981/dropbox-cant-generate-access-token-missing-scope
https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/I-no-longer-have-full-access-with-my-API/td-p/445370
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