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User Not Found after successful User migration from Sitecore 8.2 Core to Sitecore 9.0.1 Core DB

Dear All,
I have successfully migrated User's from Sitecore 8.2 to 9.01. I can see the user's in my new Sitecore instance(9.0.1).

I can even login with those users to Sitecore Experience Platform.

But when I am trying to log in for the same user's through the code it's returning "User Not Found"

1) User.Exists(username ) ---> false
Even if user is there in system

Kindly advise

 

Thanks