Additionally, you will also lose stored data, files, unused credits, and subscriptions (Xbox gaming subscriptions, for example) you have on any of these Microsoft services. And when you do this (delete Skype/Microsoft account), you’ll consequently lose access to other services (Outlook, Hotmail, OneDrive, etc.) connected to your Microsoft account with the same email. In the real sense of it, deleting your Skype account technically means you’re deleting your Microsoft account. And just like you cannot use Skype without owning a Microsoft account, you cannot delete your Skype account without deleting your Microsoft Account. Skype is one of the many services and products you have access to when you open a Microsoft account. So you cannot delete your Gmail account without deleting/deactivating your Google account. You only need a single Google account to access most of Google’s services. And this is because your Skype account is not a standalone service. when you install the 'Admin Center 2019' choose a different port number (port 443 must be used for Skype).Well, it isn’t exactly possible to delete a Skype account.*Even if you remove the Admin Center 2019 before the installation. Please choose a different port, in the event you need or want to put Windows Admin Center 2019 on a server with Skype for Business Server 2019. In fact, you will not be able to connect to any Internal Web Service URL. Why is this the case? If Windows Admin Center 2019 is running on port 443, you will not be able to connect to the server using the Skype for Business Control Panel, nor will you be able to connect to any internal web service running on the server (Address Book Web Service, Autodiscover Service, WebTicket Service, etc).

There's a likelihood you might choose port 443, but if that machine has Skype for Business Server 2019 installed on it, or is going to have Skype for Business Server 2019 installed on it, then you must choose a different port number. If you are installing Windows Admin Center 2019 on your Windows Server 2019 machine, it will prompt you for a port to listen on. I did some research about this error and I found what causing this error.

Delete skype account 2019