what is recommended authentication and login at Web API 2 OData back-end?

I'm building a cross-platform Xamarin Forms app, and need to let the user log in to a Web API 2 OData back-end (OData v3 and v4 supported).

What's the best approach for A: authenticating with OWIN and B: being able to retrieve current user identity in service methods to establish query filters to enable multi-tenancy?

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