Azure authentication libraries for re usability

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MVC

Azure

Microsoft

ASP.NET5

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My understanding on asp.net core so far:

ASP.NET CORE application targeting .net framework -- not open source and does not support multi-platform -- for this setup can i call i am using ASP.NET with MVC 6?

ASP.NET CORE application targeting CORE framework -- open source

The question i have is:

1. I am going to develop some re-usable libraries for authentication against Azure Active directory and querying Azure AD using MS Graph and then i will have to integrate it in other applications to change the authentication mechanism.

lets say I created these libraries using asp.net core with .net 4.6 target framework. If i have to integrate these in other applications which includes :
1. applications developed using MVC <5
2. applications developed using web forms
3. applicaitons developed using .net and angular
4. applications developed using .net console.

, will i be running into any compatibility issues or any other issues that i should know before i take this decision .

Can some one provide nice solutions on how to replace authentication of various existing applications to get authenticated via azure AD .Any best practices. Also based on role , group , corresponding authorization on resources should work.

Any explanation , guidance will help.

Thank You!

What I have tried:

Trying to google and look for differences and understand concepts