I understand you want to transfer your Skype credit balance to your Teams account.
In addition to what the Q&A Assist answered under your post, you can sign into Microsoft Teams Free using your Skype login email. While Skype credit cannot be transferred to Microsoft Teams, you can continue using your existing Skype credit to make calls via the Skype Dial Pad on the web.
Just to avoid any misunderstanding. Skype Dial Pad is not available in Microsoft Teams Free application. The Skype Dial Pad button available in settings is only a shortcut to Skype Dial Pad site on the Web.
In case your credit has already expired due to not being used within the last 180 days, this credit can be reactivated via: https://secure.skype.com/portal/settings/credit/reactivate
For more details, please refer to these official sources:
- Skype is retiring in May 2025: What you need to know - Microsoft Support
- Make a call with Skype Dial Pad in Microsoft Teams Free - Microsoft Support
Thank you for your understanding.