Impossible to register android device in Azure Notification Hub

0

I am trying to update my platform (mobile app in xamarin forms and backend in .net7) to set notifications on android devices via the google Fcmv1 system. Unfortunately I can't register the device on my Azure Notification Hub. I tried the various codes that I found on the official documentation but without success. My app sends token to backend and backend tries registration on hub. I don't get any error but anyway I don't find device on hub.

I tried

var nhClient = NotificationHubClient.CreateClientFromConnectionString(ConnectionString, HubName);
var installation = new Installation
{

                InstallationId = $"{device.ID}",

                Platform = NotificationPlatform.FcmV1,

                PushChannel = device.Token,

                PushChannelExpired = false,

                UserId = $"{device.ID}"

            };

await nhClient.CreateOrUpdateInstallationAsync(installation);

and also

var nhClient = NotificationHubClient.CreateClientFromConnectionString(ConnectionString, HubName);
var tags = new HashSet<string> { "tag1", "tag2" };
FcmV1RegistrationDescription registration = await nhClient.CreateFcmV1NativeRegistrationAsync(deviceToken, tags);

and also

var nhClient = NotificationHubClient.CreateClientFromConnectionString(ConnectionString, HubName);
var installation = new FcmV1Installation($"{device.ID}", device.Token);
await nhClient.CreateOrUpdateInstallationAsync(installation);

The hub works correctly for both iOS and android with the old GCM system that now no longer working but the device registration occurs correctly using this code

var installation = new Installation
            {
                InstallationId = $"{device.ID}",
                Platform = NotificationPlatform.Fcm,
                PushChannel = device.Token, 
                PushChannelExpired = false,
                UserId = $"{device.ID}"
            };

I'm really frustrated about this problem. Any idea? Thanks

I tried code found here: https://video2.skills-academy.com/en-us/answers/questions/1533052/where-i-can-download-new-version-of-microsoft-azur and other code found on web (pretty much the same of official doc)

I expect to find registered device on hub