Unable to log in to Cloudflare, "SSO Connector not found" in browser dev tools

I am completely unable to log in to any of my Cloudflare accounts, the log in screen keeps loading forever and never even prompts me for my 2fa code. In my browser dev tools, I can see a POST request to https://dash.cloudflare.com/api/v4/sso/connector?domain=<redacted-my-domain> failing with response code 400, the body is
{
    "success": false,
    "errors": [
        {
            "code": 404,
            "message": "SSO Connector not found"
        }
    ],
    "messages": [],
    "result": null
}


I have never configured SSO for any of my accounts.

Is anybody else seeing this?
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