Lol Cloudflare's own captcha is broken so you can't log into your account
Keep trying and you'll get in eventually, unless the situation got worse.
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You can see their "login" button process the captcha with a "..." and then fail and then it remains greyed-out.
I had that too, but after a few minutes I was able to log in.
I don't use their tunnels for most things, but I should get rathole or similar running instead.