Skype account on 2 devices?

I'm a layperson in the field of skyping. I have successfully installed Skype on my smartphone for a long time - telephone contacts have been taken over. Now I have installed Skype on my notebook and logged in with the same account, but no contacts are shown. Why not? Do I have to create a 2nd Skype account for the notebook?

Yes, unfortunately with Skype, all contacts are gone. Unfortunately you have to add them all again.

Each contact individually manually?

Yes, it was with me.