503+403 error

Hi, everyone.
I have only one firewall rule which is managed challenge to every visitor. When I have it, my sitemap gets a 403 error. After I remove it, the sitemap gets a 503 error. As you can see in the screenshot, Cloudflare is the cause.
CF-RAY: 6e3f497dae8d2530-SJC
How can I fix it?
Many thanks.


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