This is an enterprise-only feature. Please contact us in slack or via email (hello@dynamic.xyz) to enable.
Dynamic supports signing in with third-party JWTs — read about it here. In this page we’ll show how that can be achieved with our React Native SDK!
Notice that third-party auth must be enabled in your environment’s dashboard settings first! See how to here.

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Providing an external JWT to dynamic

Once you have access to your user’s JWT and ID, just pass them both to Dynamic by calling: 
await dynamicClient.auth.signInWithExternalJwt({ externalJwt, externalUserId })
or 
await dynamicClient.auth.verifyWithExternalJwt({ externalJwt, externalUserId })
This promise resolves when the sign in is complete — and that’s it! You’re done. You can find the reference for this method here.