Issue setting UseSSL on admin dashboard

I have SSL certificate installed :




Also have allowed :

To do this, log in to your Cloudflare account and navigate to the "SSL/TLS" section. Under the "Edge Certificates" tab, ensure that "Always Use HTTPS" is turned on.

After this still if I set UseSSL  on admin dashboard the site breaks. What am I missing?

Managed to solve it had to do this:

Set UseSSL on the admin dashboard .

On cloudflare go to SSL/TSL tab and set:

Your SSL/TLS encryption mode is Full
Encrypts end-to-end, using a self signed certificate on the server

Restarted site on IIS and it worked.