Identity.createJwt return an invalid token

I am trying to use jwt authentication for zendesk support on my iOS app:

Zendesk.initialize(appId: "<#appId#>",

               clientId: "<#clientId#>",

               zendeskUrl: "<#zendeskUrl#>")

Support.initialize(withZendesk: Zendesk.instance)

// Set an identity for authentication.

let identity = Identity.createJwt(token: myToken)

Zendesk.instance?.setIdentity(identity)

But Identity.createJwt return me an invalid token: if I put it in https://jwt.io/, I don't have 'name' in response payload.

When I call my API with curl, the token is correct.
So, can the problem is with Identity.createJwt ?
Shouldn't Identity.createJwt return the same token as the api?