Cannot access jwt protected api endpoints

When I use Postman app to try to test the endpoints that are protected by your plugin:

First: Auth is enabled. I use that endpoint to get a token. That works fine.

Second: I use Header: “Authorization: Bearer (that token)” to try to access api protected endpoints, as enabled in the admin ui for your plugin:

I get error:

{
    "code": "invalid_username",
    "message": "<strong>Error</strong>: Unknown username. Check again or try your email address.",
    "data": null
}

…every time, no matter what user I use and what new token I create.

Can you please tell me what I might be missing? Is this expected behaviour?

—

Sidenote: Without a token, i get the expected result:

{
    "success": false,
    "data": {
        "message": "Your are not authorized to access this endpoint.",
        "errorCode": 403,
        "type": "simple-jwt-login-route-protect"
    }
}