Bgameshop.in.th can't add site

It can be caused by you trying to add the domain too many times in a short time-frame.
As the message says, this is temporary issue and you should be able to add your domain later.
If it has been the same way for a few days or more, then you will need to contact support.

Have you already contacted the Cloudflare support?
If not, could you please open a Support Ticket as follows:

  1. Login to your Cloudflare account
  2. Contact Cloudflare Support

As @DotMrCode replied:

This article below can help too:

In case if needed, post your ticket number here in the reply.