When I tried to analyze my website pages, the same error occurred on the pagespeed.web.dev online analyzer.

However, after looking at the above comment Pham Tung, I checked my SSL certificate. Interestingly, the SSL cert showed AVG as the provider.

I disabled AVG anti-virus Web Shield, the original SSL Cert loaded after page refresh, and used the Chrome Lighthouse to analyze the page and online tool too, it worked fine.