500 error after activating Cloudflare

I’m trying to set up Cloudflare for a new website but getting a 500 error message.

When I pause Cloudflare (i.e. use just DNS settings) I can get the site but as soon as I reactivate CF the 500 error message comes back.

I have removed SSL, but still not sure how to troubleshoot this.

And it works with HTTPS when paused?

That domain has been on Cloudflare for at least two years. What’s changed?

Yes, It works with https when paused.

It was forwarding to another domain before.

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