OAuth2 suddenly started failing with "Unable to load conversation undefined"

I’m making my first Custom GPT and I got a custom Action to work as well. However, after making a few changes, the Action’s OAuth is constantly failing with “Unable to load conversation undefined” error.

What could be going wrong? How to debug and fix this?

Also having this issue, not a new problem. Surprised there are not more posts about this as it is entirely blocking usage of a critical gpt for us. Was working fine until we updated a custom action, now OAuth fails every time across devices and browsers. Reverting to the previous action code did not fix it, seemingly no way to fix from our end

EDIT: Deleting and re-creating the CustomGPT solved the issue, though this is not a reasonable long term solution

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