Python API Short-lived access token for Dropbox

I may not be fully understanding this, but here's the issue. I'm trying to get a short-lived token that can be used repeatedly. The first time through, I am prompting through the command line. I can get the token from Dropbox and when I test it (using files_list_folder) it works.

However, if I try to then use that token on subsequent Dropbox API calls, I get invalid_access_token.

Here is the code I am using to get the access token.

    def get_token_no_redirect(self):
        oauth_result = ""
        auth_flow = oauth.DropboxOAuth2FlowNoRedirect(consumer_key=self.app_key, consumer_secret=self.app_secret,
                                                      token_access_type="offline")
        authorize_url = auth_flow.start()
        print(f"1. Go to: {authorize_url})")
        print("2. Click \\Allow\\ (you might have to log in first).")
        print("3. Copy the authorization code.")
        auth_code = input("Enter the authorization code here: ").strip()
        try:
            oauth_result = auth_flow.finish(auth_code)
        except Exception as e:
            print('Error: %s' % (e,))
        return oauth_result

I also tried this sending "online" instead but still got the error.

Is there another way to get a token that can then be used on future requests?