Refresh Token for Python Project

Dropbox is no longer offering the option for creating new long-lived access tokens. Dropbox is now issuing short-lived access tokens (and optional refresh tokens) instead of long-lived access tokens. You can find more information on this migration here.

Apps can still get long-term access by requesting "offline" access though, in which case the app receives a "refresh token" that can be used to retrieve new short-lived access tokens as needed, without further manual user intervention. Refresh tokens do not expire automatically and can be used repeatedly. You can find more information in the OAuth Guide and authorization documentation. There's a basic outline of processing this flow in this blog post which may serve as a useful example.
 
Also, note that you do not need to implement the refresh process yourself. The Dropbox Python SDK will handle that logic for you as long as you pass the refresh token, app key, and if needed (when not using PKCE), app secret to the Dropbox client. The code you used does not request a refresh token. Instead, for the official Dropbox Python SDK, you can find examples of how this works with refresh tokens at the following links:

• https://github.com/dropbox/dropbox-sdk-python/blob/main/example/oauth/commandline-oauth-scopes.py
• https://github.com/dropbox/dropbox-sdk-python/blob/main/example/oauth/commandline-oauth-pkce.py

As for the SSL error you mentioned, that seems to indicate an issue establishing a secure connection to the Dropbox API servers from that computer. Check for anything on that computer, such as a VPN, proxy, firewall, or other security software that may be interfering with your network connection.