502 error on my website

in last days when I try to activate cloudflare on cotazur.it, I have 502 error. All Clouflare Ip are in whitelist.
Can you help me pls?

A 502 usually isn’t a whitelist issue. It’s quite possible your host changed the IP address of your server. Here are some tips:

Hello, thanks for reply.
From sever they said me all Cloudflare IP are unblocked.

Yes we changed Ip address lately but we checked many times with them
Need to copy the Ray ID error to understand better?

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