I've tried to add an Apple Developer Account in Visual Studio 2017 but when I go Tools/Options/Xamarin/Apple Accounts, the Add button is disabled:
I have tried to update but still isn't working (Visual Studio Enterprise 2017 15.9.29), besides I have a Mac paired already by IP
You VS could do that. Apple account management is available on Visual Studio for Mac, Visual Studio 2019, and
Visual Studio 2017 (Version 15.7 and higher)
.You must also have a paid Apple Developer account to use this feature. Before you begin, be sure to first accept any user license agreements in the Apple Developer portal.
You could check the requirements and steps on MS docs. https://learn.microsoft.com/en-us/xamarin/cross-platform/macios/apple-account-management?tabs=windows#add-an-apple-developer-account