Help me. net::err_cert_common_name_invalid

This prompt often appears when accessing the pages I have deployed that are bound to a custom domain name. I just bound my subdomain and the top-level domain is not hosted on Cloudflare. I have been searching for various materials in the past few days, hoping to solve this problem. Unfortunately, it did not work as I had hoped. This problem still exists. I would greatly appreciate it if you could request the support of the official technical personnel to help me solve this problem

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