Firebase sendEmailVerification() not work - email-verification

Question

on click signin btn.
want to sending user email verification link but verification link not send
binding.signIn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
userSignIn();
}
});
userSignIn() method in which i check that user is verified or not if not so send verification link
signIn method method in which i check that user is verified or not if not so send verification link
protected void userSignIn(){
if(binding.textInputEmail.getText().toString().isEmpty())
{
binding.textInputEmail.setError("Email is Required");
binding.textInputEmail.requestFocus();
return ;
}
if(binding.textInputPassword.getText().toString().isEmpty())
{
binding.textInputPassword.setError("Password is Required");
binding.textInputPassword.requestFocus();
return;
}
if(!Patterns.EMAIL_ADDRESS.matcher(binding.textInputEmail.getText().toString().trim()).matches())
{
binding.textInputEmail.setError("Please Provide Valid Email");
binding.textInputEmail.requestFocus();
return ;
}
progressDialog.show();
auth.signInWithEmailAndPassword(binding.textInputEmail.getText().toString().trim(),
binding.textInputPassword.getText().toString().trim()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
progressDialog.dismiss();
if(task.isSuccessful())
{
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
assert user != null;
if(user.isEmailVerified()) {
startActivity(new Intent(SignInActivity.this, MainActivity.class));
finish();
} else {
user.sendEmailVerification().addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if(task.isSuccessful())
{
Toast.makeText(SignInActivity.this, "Please verify your email.\n Email Verification link is send on gmail"+
user.getEmail(), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(SignInActivity.this, Objects.requireNonNull(task.getException()).getMessage(),Toast.LENGTH_SHORT).show();
}
}
});
}
} else {
Toast.makeText(SignInActivity.this, Objects.requireNonNull(task.getException()).getMessage(), Toast.LENGTH_SHORT).show();
}
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
progressDialog.dismiss();
Toast.makeText(SignInActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
dependencies
plugins {
id 'com.android.application'
id 'com.google.gms.google-services'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.example.s"
minSdk 21
targetSdk 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildFeatures {
viewBinding true
}
}
dependencies {
implementation 'androidx.appcompat:appcompat:1.4.2'
implementation 'com.google.android.material:material:1.6.1'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
// Also declare the dependency for the Google Play services library and specify its version
implementation 'com.google.android.gms:play-services-auth:20.2.0'
implementation 'com.google.firebase:firebase-database:20.0.5'
implementation 'com.google.firebase:firebase-auth:21.0.6'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.google.firebase:firebase-storage:20.0.1'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
implementation 'com.github.iammert:ReadableBottomBar:0.2'
implementation 'de.hdodenhof:circleimageview:3.1.0'
implementation "com.airbnb.android:lottie:5.2.0"
implementation 'com.github.ybq:Android-SpinKit:1.4.0'
implementation 'com.github.dhaval2404:imagepicker:2.1'
implementation 'com.squareup.picasso:picasso:2.8'
implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation 'com.android.volley:volley:1.2.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}