Why doesn't my Keychain verification code get sent to my fone

Hey Shad B.,

This article should prove relevant to the issue you are experiencing:

Get help using iCloud Keychain

http://support.apple.com/kb/TS4644

I'm not receiving the verification code via SMS.

1. Make sure that you have a strong cellular network connection on your phone.
2. Make sure that your phone number can receive SMS messages. You can do this by asking someone to send you a text message.
3. Make sure that the correct phone number is associated with your account:
   • iOS 7.0.3 or later: Tap Settings > iCloud > Account, then tap Keychain. Make sure the phone number under Verification Number is correct. If not, enter another phone number.
   • OS X Mavericks v10.9 or later: Choose Apple () > System Preferences. Click iCloud, then click Account Details. Make sure the phone number listed under Verification number is correct. If not, enter another phone number.
4. If you can't access a device that has iCloud Keychain enabled, you can contact Apple Support and verify your identity to get help completing iCloud Keychain setup.

Thanks for being a part of the Apple Support Communities!

Regards,

Braden

I receive SMS just fine. Apple's own Apple ID verification codes arrive fine (those are the 4 digit codes). But the 6 digit Apple keychain verification code never arrives here. I'm in Thailand, country code 66. Tried both from my iPad and from the Mac.