Cloud sync error on SimCity 3000 Unlimited (custom save file location)

Hello, I have SimCity 3000 Unlimited installed on my Steam Deck via GOG. The game itself works fine, but I am not able to get my saves to sync with the cloud. Now I don't know if the game does not support cloud sync - btw could someone tell me how to find this information? - but assuming it does, the default save path set by HGL is incorrect and it needs to point to "<installFolder>/Cities" where each played city gets stored as an ".sc3" file. No matter, I set the path in HGL under the "Cloud Saves Sync" section to this path, and hit the sync button with the "upload" option selected, but I get this error:

[SAVES] INFO: Local files: 60
Traceback (most recent call last):
  File "gogdl/cli.py", line 51, in <module>
  File "gogdl/cli.py", line 47, in main
  File "gogdl/saves.py", line 109, in sync
  File "gogdl/saves.py", line 235, in get_auth_ids
KeyError: 'clientId'
[371] Failed to execute script 'cli' due to unhandled exception!


Any idea what the issue may be here?
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