This from italki Support::

(drop down menu next to your italki profile picture and select Support, then search for skype)

What is my Skype Account ID/Name?

Skype Accounts

There are two types of Skype accounts:

<ul><li>Skype accounts with a username. This username is what we call a Skype ID.</li><li>Skype accounts with an email address attached to a Microsoft account. This is the account you use for Microsoft Products (Windows, Xbox etc.). This means that your account ID is your Live ID, e.g. italki_320941. </li></ul>

<em>We recommend that you use a Skype account with a Skype ID because an email address can be linked to multiple accounts, while Skype IDs are unique.</em>

How to Find Your Skype ID on Windows

To find your Skype ID on Windows, simply select your profile picture, and your Skype name will be displayed in your profile next to "Signed in as".

So in other words - it works fine with email ID but your email isn't unique so a search might find more than one possible account. If the person you want to talk to has a unique skype ID it might be simplest if you message/call them the first time that way they won't have any confusion about finding you

Hello, try to enter to the Skype application with your current Microsoft ID, your e-mail

Why don't you use or ask your teacher to use another learning platform?

Thanks. I can put my microsoft Id down when they ask for skype Id, is that how it works?