Wordpress Woocommerce Stripe is enabled, but a SSL certificate is not detected

Error message: Stripe is enabled, but a SSL certificate is not detected. Your checkout may not be secure! Please ensure your server has a valid SSL certificate.

I’ve set the SSL/TLS encryption mode to “Full (strict)”. Do I need to do something else? How soon does the changes get reflected?

What is the domain name? I have a doubt that the site is not actually proxied or you have some particular DNS setup.