When I refresh my access token using this API
curl https://api.dropbox.com/oauth2/token \
-d grant_type=refresh_token \
-d refresh_token=<REFRESH_TOKEN> \
-d client_id=<APP_KEY> \
-d client_secret=<APP_SECRET>
I get this error: user for app is not enabled.
I can't find information about this error anywhere in the documentation or somewhere else on the Internet.
Please help me. What are the possible causes of this error and how could I troubleshoot it? Thanks.