Hello, everyone,
 
Thanks you all for your help.
 
In my implementation, users have 3 states,
 
1. Need activation.
2. Enabled.
3. Disabled.
 
So I use below method my my freeradiuis server.
Update the attribute value to 3 status based on needs. It works.
1. Needactivation
2. Password
3. Disabled
 
There're a couple of other solutions as people advised. I will try that needed.
 
Thanks!
 
Tom