Invalid Configuration on vercel domain

I have hosted my web app on vercel for nearly a year no with no problems. All of a sudden i have started receiving emails that some of my domains are incorrectly configured. Which i thought was weird because i hadn't changed anything.

I contacted support and they said it's because my traffic is proxied through cloudflare.

My question is why the sudden change, and has anyone else experienced it?

(also i know people are gonna say it's best practice not to proxy on top of vercel. but i'd rather cloudflare deal with DDoS than vercel tbh)
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