This is a common problem with Skype for Windows when behind a firewall or if Zaplee is setup incorrectly. Please take the following steps:
- add "zaplee.com" as a contact in Skype - Zaplee will automatically accept as a contact
- make sure your firewalls are configured properly - https://support.skype.com/en/faq/FA148/which-ports-need-to-be-open-to-use-skype-for-windows-desktop
- Also open port 5060
Once all this is done, log out of Skype, Quit Skype, and then restart and log back in. This should resolve the issue but if it doesn't, please contact our support department or create a ticket.