API wont be triggered using domain

I have a Java web service written in Java language.
the web service’s APIs are triggered by tradingview webhooks.
it was working with the sub-domain defined inside the cloudflare DNS manager, but suddenly, I had no more API calls.

I checked everything, even contacting my AWS supports to check if the cloudflare ips were blocked or something, and the answer was no; everything was ok but no API calls.
the API was being called when I changed the destination from the domain back to the direct IP of my server, which proves the domain actually caused the problem.

at first, I thought the problem was related to the SSL issues and tried to set the destination of my webhooks to the HTTP domain instead of HTTPS but the problem occurred once more.

please help me. what should I do?

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