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I have a problem setting up Device Flow authorization with IdentityServer4. So I have a created a client with the following properties

new Client

 ClientId = "XXXXXXXXXXXXXX",
 ClientName = "XXXXXXXXXXXXXX",
 AllowedGrantTypes = GrantTypes.DeviceFlow,
 AccessTokenType = AccessTokenType.Jwt,
 ClientSecrets = new List<Secret> 
 
 new Secret("XXXXXXXXXXXXXX".Sha256()) 
 ,
 AllowedScopes = new List<string>
 
 "XXXXXX"
 ,
 Enabled = true,
 AllowAccessTokensViaBrowser = true

Then, from the device I am doing the following request (the requests are taken from the example here):

POST /device_authorization HTTP/1.1
Host: server.example.com
Content-Type: application/x-www-form-urlencoded

client_id=459691054427

Which returns the following:

HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-store


 "device_code":"GMMhmHCXhWEzkobqIHGG_EnNYYsAkukHspeYUk9E8",
 "user_code":"WDJB-MJHT",
 "verification_uri":"https://www.example.com/device",
 "verification_uri_complete":"https://www.example.com/device?user_code=WDJB-MJHT",
 "expires_in": 1800,
 "interval": 5

Afterwards I keep polling with the device to the Authorization server, which responds:

authorization_pending

Then from the user I am sending the following request to authorize the device:

POST
https://XXXXXXXXX/device/userCode

with an authorization header containing the:

Bearer token_value

of the logged in user from another client application.

However, what I get as a reply is the following:

No user present in device flow request

Which also returns the error in identity server:

IdentityServer4.Services.DefaultDeviceFlowInteractionService:Error: Device authorization failure - no user found

My code for authorizing the device is the following (nothing special just to test it from Postman):

var result = new DeviceFlowInteractionResult();

var request = await _interaction.GetAuthorizationContextAsync(userCode);
if (request == null)

 return result;


ConsentResponse grantedConsent = new ConsentResponse

 RememberConsent = true,
 ScopesConsented = new List<string> "XXXXXXXX" ,
;

result = await _interaction.HandleRequestAsync(userCode, grantedConsent);

return result;

Is anybody familiar with this error?
Does it have to do the user is connected to another client through the authorization server?

I cannot seem to find any proper tutorials around this matter.