Same domain name accessing external website I get RED HTTPS

I have an internal domain with the same name as my website. I have a WWW cname record inside my DNS at the Microsoft server to point to the external website. It works, but I get a RED HTTPS not secure though the website loads fine just see that error. If I am outside the building, the website loads fine and the SECURE HTTPS works. I have DNS and WWW inside the Cloudflare DNS settings. What am I missing?

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