Nuget Private Package Unavailable [closed]

I am using VS-2019 and this is a legacy application on .Net MVC

Trouble is that this nuget package is unavailble for whatever reason... So when I'm trying to remove or restore but nothing works. It keeps erroring out with this message.

I am not able to restore even other packages because of this error

Things I have tried

• Changing the setting to restore package from a different url
• removing packagebut none of these worked