Steffen,

I have found that when my Microsoft oauth2 refresh token expires, the oauth2-helper.py program doesn't get me a new one. The song and dance with typing a code into a browser window gets a new access token, but no new refresh token.

The reason is that in order to get a refresh token, your resource file has to include "offline_access" in its scope. However, when you authorize with Microsoft they produce a response that doesn't include "offline_access" in its scope, even if the resource file that you are starting with does. The helper program produces a template that includes "offline_access" and so you do get a refresh token when you start from scratch. But the resource file that your first authorization produces doesn't have "offline_access", so when its refresh token eventually expires, you don't get a new one.

I have found several Microsoft pages that confirm this behavior, but I don't understand their explanation for it - I get a headache trying.

However, there appears to be simple solution: ignore the scope in the response from Microsoft and keep the scope you already have. I have attached a patch that comments out a couple of lines in the helper program to achieve that. It seems to work for me. I note that you already describe the lines I have commented out as "optional". It looks as if they are in fact positively harmful.

Stephen Isard
--- ./s-nail-oauth-helper.py    2025/05/17 19:40:51     1.1
+++ ./s-nail-oauth-helper.py    2025/05/17 19:43:23
@@ -342,8 +342,8 @@
        # OPTIONAL
        if resp.get('refresh_token'):
                cfg['refresh_token'] = resp.get('refresh_token')
-       if resp.get('scope'):
-               cfg['scope'] = resp.get('scope')
+       #if resp.get('scope'):
+       #       cfg['scope'] = resp.get('scope')
 
        print('%s' % cfg['access_token'])
        return config_save(args, cfg, dt)

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