cURL error 51: SSL peer certificate from Automate

I had a chat last week reference automate not working on a lot of sites, and I was advised to contact my host and see if they have an issue but we have found a common issue between the sites where to automate works and they don't.

After some tests I realized that it only works on the site that has SSL Installed, unfortunately, I can install free SSL on this host, is there any way to help me on this?

The Error is

cURL error 51: SSL peer certificate
or SSH remote key was not OK