Not able to add ChatGPT App/MCP Server to ChatGPT

Same here! I was able to connect tour MCP server 2 or 3 days ago. I removed it for testing purposes and now if I want to connect it again I am getting Error: MCP server url does not implement OAuthand nothing else. Our server has oAuth 2.1 implement and I can see in the server log that chatgpt is sucessfully fetching from the .well-known endpoint!