The ‘missing_scope’ error indicates that while the app is permitted to use that scope, the particular access token you’re using to make the API call does not have that scope granted. Adding a scope to your app via the App Console does not retroactively grant that scope to existing access tokens.
That being the case, to make any API calls that require that scope, you’ll need to get a new access token with that scope.
From python - Missing scope error Dropbox API authentication? - Stack Overflow
Maybe adding a new connection for that particular step will do the trick?