Problem with CNAME forum.binh-thanh.tk to binhthanh.forumvi.com

I set CNAME forum.binh-thanh.tk to binhthanh.forumvi.com, but when I type it at Admin Panel it says:

The supplied domain name is not well configured
Your CNAME must redirect to : binhthanh.forumvi.com

Here is what I do at DNS server (saved changes):

How should I fix this problem? Thank you very much!

Hello,

Have you read this tutorial before configurate it ?
https://help.forumotion.com/t7021-redirect-an-extern-domain-name-that-you-own-to-your-board

Yes, I have read it carefully. The domain http://forum.binh-thanh.tk is pointing to ForuMotion. But when I change forum domain, I see that error.

Rideem3 wrote:You must wait 24 - 72 hours for the domain to properly propagate.

I waited for a week but above error still appear. Help me!

Hello,

Please take a look to this thread as it's a similar issue : https://help.forumotion.com/t114515-tk-domains-don-t-work?highlight=tk+domains