SSL issue on subdomain

What is the name of the domain?

https://forms.aupacs.com/s3/onboarding

What is the error number?

I don’t know error number

What is the error message?

It’s SSL security warning

What is the issue you’re encountering

SSL is giving security warning

What steps have you taken to resolve the issue?

I have executed the following commands at the prompt:
netsh winsock reset
ipconfig /flushdns

What are the steps to reproduce the issue?

Please open this https://forms.aupacs.com/s3/onboarding URL. You will see the SSL warning issue. The subdomain is being pointed to https://app.alchemer.com

There appears to be a Cloudflare origin certificate being used, but the record is not proxied…
https://cf.sjr.dev/tools/check?7c13c0d7df25493d93507ae80deab253#dns

* Server certificate:
*  subject: O=CloudFlare, Inc.; OU=CloudFlare Origin CA; CN=CloudFlare Origin Certificate
*  start date: May 29 03:05:00 2020 GMT
*  expire date: May 26 03:05:00 2035 GMT
*  issuer: C=US; O=CloudFlare, Inc.; OU=CloudFlare Origin SSL Certificate Authority; L=San Francisco; ST=California
*  SSL certificate verify result: self signed certificate in certificate chain (19), continuing anyway.

Using a Cloudflare origin certificate requires use of the proxy as it is only trusted by Cloudflare…

Thanks for the clarification, so I need to enable proxy in the DNS record on Cloudflare, right?