How I can register already created canvas app on azure AD portal for user authentication from private API ?????

[Rsalame]

Scenario:-   I want to authenticate user access through private Api. and for that purpose, I want to get access token from Azure Ad.

I know we can register app on azure AD and get access token.

But When I tried to register my already created canvas app on azure portal. Unable to find it.

I did register app on azure with different name which is not a part of my canvas app.

So please anyone suggest me what I suppose to do.........

canvas app Name is  : TestCollection