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GoogleCredentials: getTokenValue() works on emulator, but not on an actual device

For use on a mobile app, I'm authenticating for a Firebase realtime db. The code for reading the private key and generating an access token works fine on the Android emulator, but generates an error on an actual phone.
Here's the code:
private String getToken () {
try {
InputStream serviceAccount = getApplicationContext().getAssets().open("asset.json");
GoogleCredentials googleCred = GoogleCredentials
.fromStream (serviceAccount)
.createScoped (Arrays.asList(
"https://www.googleapis.com/auth/firebase.database",
"https://www.googleapis.com/auth/userinfo.email"
));
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
return googleCred.refreshAccessToken().getTokenValue();
}
catch (Exception e) {
Log.d ("getToken", "Auth 2 Error: " + e);
return "";
}
}
catch (Exception e) {
Log.d ("getToken", "Auth 1 Error: " + e);
return "";
}
}
When this code is run on the phone, the error generated is:
Auth 2 Error:
I5.m: Error getting access token for service account: 400 Bad Request
POST https://oauth2.googleapis.com/token
{
"error": "invalid_grant",
"error_description": "Invalid grant: account not found"
}
iss: xxxredactedxxx#appspot.gserviceaccount.com
The private key asset is being read correctly on both emulator and phone, so I suspect the problem is not in the code, but something in my Firebase and/or Google Cloud setup. What "account" is needed when the app is run on a phone but not in the emulator? And where would I set up that account?
Edit: In the Google Cloud Service Accounts page, I've added the iss account (in the error message) to "Principals with access to this Service Account" table:
Principal: xxxredactedxxx#appspot.gserviceaccount.com
Name: App Engine default service account
Role: Editor
Service Account Token Creator
(To be clear, I'm not using logins or other userid/password-style authentication; the app should connect internally to its db in Firebase in a read-only mode, based on the private key).

Issue with connecting tfs using java tfs sdk programatically

I have code where i'm connecting to TFS using java tfs sdk like below,
*
*Credentials credentials = new UsernamePasswordCredentials( "xxxxxx", "XXXXX"); getConnection(serverURI, credentials, maxDate, buildNo);
}
private static void getConnection(URI serverURI, final Credentials credentials, String maxDate, String buildNo)
{
TFSTeamProjectCollection tpc = null;
try{
tpc = new TFSTeamProjectCollection(serverURI, credentials);
tpc.authenticate();
}catch(Exception e){
System.out.println(e.getMessage());
}*
But its stop authenticating using username and password, what the alternative authentication type like PAT - i need code to authenticate it, please help on this.

I tested with username and password as credentials, and I can connect to TFS normally on my side.
Here is a ticket you can refer to .

XMPPError: bad-request - modify error create new user using smack library 4.1.8 and openfire

i have been developing a chat application using smack client library 4.1.8 and xmpp server(openfire server) but while trying to create new user using Accountmanger class it raises and exception "XMPPError: bad-request - modify"
XMPPTCPConnectionConfiguration conf = XMPPTCPConnectionConfiguration.builder()
.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled)
.setHost("127.0.0.1")
.setDebuggerEnabled(true)
.setPort(5222)
.setSendPresence(true)
.setServiceName("127.0.0.1")
.build();
AbstractXMPPConnection conn2 = new XMPPTCPConnection(conf);
//conn2.login();
conn2.connect();
AccountManager accountManager = AccountManager.getInstance(conn2);
if (accountManager.supportsAccountCreation()) {
accountManager.sensitiveOperationOverInsecureConnection(true);
accountManager.createAccount("qidus", "123456");
conn2.login("qidus", "123456");
}
} catch (SmackException | IOException | XMPPException e) {
e.printStackTrace();
}
and the exception is this
04:01:41 AM SENT (0): <iq to='127.0.0.1' id='aYej1-3' type='get'><query xmlns='jabber:iq:register'></query></iq>
04:01:41 AM RECV (0):
org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPPError: bad-request - modify
at org.jivesoftware.smack.XMPPException$XMPPErrorException.ifHasErrorThenThrow(XMPPException.java:135)
at org.jivesoftware.smack.PacketCollector.nextResultOrThrow(PacketCollector.java:232)
at org.jivesoftware.smack.PacketCollector.nextResultOrThrow(PacketCollector.java:213)
at org.jivesoftware.smackx.iqregister.AccountManager.getRegistrationInfo(AccountManager.java:332)
at org.jivesoftware.smackx.iqregister.AccountManager.supportsAccountCreation(AccountManager.java:144)
at chat.Chat$1.run(Chat.java:46)

You need to set properly Service Name. You can chek your serviceName in Openfire through admin panel (127.0.0.1:9090) it's in first page in middle of the page, look for "Server Name" after login.
By default it's your machine name.
However your code will run just once: 2nd time AccountManger will throw an exception due to already registered user.

You also get this error or exception when the username which you are passing for account creation has the null value.So check your username also.

Adding new user to ejabberd through Smack android api

I have installed ejabberd on my local server. This was then tested in spark for its functionality and it worked fine. Now I want to add a new user through the android app.
I tried adding a new user through spark and it worked fine. The fields I have given are uesrname, password, confirm password, server. But when I tried to do it using the smack api in the android app it gave the following error:
org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPPError: forbidden - auth
I was using createAccount(), seen in the code I was using below, to create the new account in smack.
AccountManager accountManager = AccountManager.getInstance(conn1);
try {
accountManager.createAccount("tryuser", "qwerty");
Log.i("log", "created user successfully");
} catch (SmackException.NoResponseException e) {
e.printStackTrace();
} catch (XMPPException.XMPPErrorException e) {
e.printStackTrace();
} catch (SmackException.NotConnectedException e) {
e.printStackTrace();
}
I have checked if it supports new account creation by supportsAccountCreation() and it returned true.
I have changed my register rule to allow all in ejabberd server. and i don't think it has any problem because i can create account from spark, but getting error in smack.
I have looked into the following SO questions related to this topic but no luck.
Ejabberd can't register new user
How to register a new user on XMPP using (a)Smack library
Does anyone have any suggestions on how to solve this?

Please give a try with below -
AccountManager accountManager = AccountManager.getInstance(connection);
try {
if (accountManager.supportsAccountCreation()) {
accountManager.sensitiveOperationOverInsecureConnection(true);
accountManager.createAccount("userName", "password");
}
} catch (SmackException.NoResponseException e) {
e.printStackTrace();
} catch (XMPPException.XMPPErrorException e) {
e.printStackTrace();
} catch (SmackException.NotConnectedException e) {
e.printStackTrace();
}
And you also need to set below in ejabberd.cfg (config file)
{access, register, [{allow, all}]}.
which means - In-band registration allows registration of any possible username. To disable in-band registration, replace 'allow' with 'deny'.
And in mod_register (module in same config file) please set below -
{access_from, register}
& before that please check you are connected to XMPP server.
Probably this will resolve your issue.

asmack android XMPP - get all users

I'm using the asmack XMPP with Android, but I have a problem. I would like a player to connect to XMPP server (only if username not already taken), receive all currently connected users and choose a user from the list to play against.
Currently I'm logging into the XMPP server like this:
/* then connect with a newly created username */
try {
if (connection != null && connection.isConnected()) {
connection.login(username, password);
}
} catch (XMPPException e) {
Log.w("[xmpp_login] Cannot connect to XMPP server with username: " + username, "0");
e.printStackTrace();
}
And for the creation of users I'm using the following code:
/* required attributes for creation of a new account */
HashMap<String, String> attr = new HashMap<String, String>();
attr.put("username", username);
attr.put("password", password);
manager.createAccount(username, password, attr);
} catch (XMPPException e) {
Log.w("[create_user] Cannot create new user: XMPP Exception.", "0");
Log.w(e.getMessage(), "0");
e.printStackTrace();
} catch (IllegalStateException e) {
Log.w("[create_user] Cannot create new user: not logged in.", "0");
e.printStackTrace();
}
I have two questions:
How can I check if the username is already taken?
How can I return a list of all currently connected (online) users to each player? Since I've googled and found nothing useful, I guess I'll have to provide that function at serverside. This is where I'm using openfire XMPP server. Is there a plugin for it that I can use that does that - then I could call some function from a client, which would call that specific plugin, which will in turn respond with all the online players.
I guess any tip is appreciated. Thank you

I found a solution. To find an answer you can google "XMPP shared group". Basically I've done the following:
Create a new group in openfire XMPP server.
Under users, make sure that you check "Enable automatically adding of new users to a group."
Of course you'll have to have the right modules enabled for those preferences to even be present.
Then we can just write the following function that will return all users from XMPP server:
/*
* Return a list of #num players currently connected. (if #num == 0: return
* all players)
*/
public ArrayList<String> xmpp_playerlist(int num) {
try {
if (!connection.isConnected())
connection.connect();
if (!connection.isAuthenticated())
connection.login(user, pass);
} catch (XMPPException e) {
Log.w("Cannot connect to XMPP server with default admin username and password.", "0");
e.printStackTrace();
}
ArrayList<String> players = new ArrayList<String>();
roster = connection.getRoster();
Collection<RosterEntry> entries = roster.getEntries();
for (RosterEntry entry : entries) {
players.add(entry.getName());
}
Log.w("**Number Users: " + roster.getEntryCount(), "0");
return players;
}