yeah this is a known limitation - n8n’s OAuth implementation doesnt support RFC 7591 dynamic client registration which ChatGPT needs to auto-create connectors. the workaround is to manually register your n8n instance as an OAuth app on your end first, then use those credentials in ChatGPT’s custom connector setup instead of relying on the auto-registration flow.
not the smoothest experience but thats the current state of it. lmk if you need help with the manual OAuth setup steps