skype4py P2P chat is not getting delivered

Question

I'm using Python script & skype4py to send the chat message but its not getting delivered.

Below is my script.

import Skype4Py
import sys

skype = Skype4Py.Skype()
skype.Attach()
user = 'user1'
message = 'Build is successful.'
skype.SendMessage(user, message)

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You can see the message is not getting delivered, its just showing circle. message loading image