Sorry, it wasn’t the 500, but it was in the 500s class.
I was freaking out too much and didn’t take a note because the system was live and I had just sent a bunch of invoices.
@Danilo Have you tried logging into IN using the private window/incognito option of your favorite browser? If that works, it’s a local browser cache issue. If not, you’ll need to share a redacted image of the Cloudflare screen so that we can see how you set this up