[Bug] AcquireTokenSilent not working after few mintunes in ios and anroid giving error

Which Version of MSAL are you using ?

MSAL 4.14.0

Platform Xamarin forms (Android and IOS)

What authentication flow has the issue?

• Mobile
  • [ this] Interactive
  • Integrated Windows Auth
  • Username Password
  • Device code flow (browserless)

Other? - please describe;

Is this a new or existing app? c. This is a new app or experiment

Repro

Initially, application opening a login page, after entering the credentials, I am able to receive the token. Once application closed and suddenly open its getting token sliently by using below method:
authResult = await App.PCA.AcquireTokenSilent(App.Scopes, firstAccount).ExecuteAsync();

But after 15-20 min , when trying to open the application its again prompting for login screen.
Please help.

Android : - Android behaving weird,AcquireTokenSilent sometimes getting proper result, but sometime getting "Broker response returned error: Failed to acquire token sliently from the broker. IN order to perform brokered authentication on android you need to ensure that you have installed either Intune company portal(5.0.4789.0 or greater) or Microsoft Authenticator (6.2001.01400 or greater).

But I have already installed both above application.

PLEASE HELP

**Expected behavior**
IOS - Should not prompt for login screen after any mintues as already entered credentials once.
Android - Should not give any error as company portal and microsoft authenticator app already installed in the device. 

**Actual behavior**
IOS - After few mins its  asking for login with credentials 
ANdorid - Anytime giving this error "Broker response returned error: Failed to acquire token sliently from the broker. IN order to perform brokered authentication on android you need to ensure that you have installed either Intune company portal(5.0.4789.0 or greater) or Microsoft Authenticator (6.2001.01400 or greater).

**Possible Solution**
NO solution. Please help me

**Additional context/ Logs / Screenshots**

[viveknegi51288]

Thanks @bgavrilMS You helped a lot… and issue is resolved now. Thanks

[bgavrilMS]

If the callback signature is

public string acquireToken(String upn, String aadId, String resourceId) then I would implement it as

var pca = PublicClientApplicationBuilder.Create(<client_id>).Build();
var accounts = await pca.GetAccountsAsync();
var account = accounts.Where(a => a.Username == upn); 
string scope = resourceId + "/user_impersonation"; // if this doesn't work try + "/.default"
var result = await pca.AcquireTokenSilent(account, new[] { scope }).ExecuteAsync();
return result.AccessToken;

Something like that. Not sure what the aadId is though, is it the client id? Or a tenant ID?