Adding a custom connector throws an error

### MCP server URL

https://ai.mentimeter.com/api/mcp

### Where does the issue occur?

When pressing the Connect button

### Transport used

streamable-http

### Client registration type

OpenID Connect Discovery (OIDC)

### SSE only: Does your server return the expected status code for POST requests?

Not applicable (my server does not use SSE)

### When did you last reproduce this?

Aug 03 13:26:42.54GMT+2

### Browser and OS

MacOS 26.5.2 (25F84)

### Describe the issue

When we tried to setup a custom connected for our enterprise workspace we get an error.

### Issue details

```shell
Error ID ofid_26b4164a16a3f1b6

```

### Expected behavior

It should register using CIMD protocol and allow users to signin

### Logs from your server

```shell

```

### Additional context

_No response_