Hello cbotari, my name is Emmanuel. An Independent Advisor and a Skype user for several years. I'll be more than happy to assist you today!
I am so sorry to hear that you are having issues using the Skype app on your computer. Can you try downloading the regular Skype app using this link
https://download.skype.com/s4l/download/win/Sky...
Alternatively, you can also access your Skype account on the web version
https://web.skype.com/ using an updated Google Chrome or Microsoft Edge browser.
For your Skype business-related concern, I would recommend you post it to the Skype for Business Forums as I can only help you with issues related to regular Skype:
https://docs.microsoft.com/en-us/SkypeForBusine...
https://techcommunity.microsoft.com/t5/skype-fo...
https://social.technet.microsoft.com/Forums/en-...
Or get help on this link
https://support.skype.com/en/faq/FA34552/where-...
You may also read the guidelines here
https://docs.microsoft.com/en-us/SkypeForBusine...
I am pretty sure that the Skype for Business Community Experts are more knowledgeable and can provide a more accurate and quick answer to this question. I hope you understand that what I am aiming for is for you to get the best possible solution and precise answer which could help you in resolving whatever issues you have at the moment.
I hope this information can help you.
Let me know if you are satisfied with how I answered your question.