firebase auth import 오류

안녕하세요! 강의 수강하고 있는 학생입니다. 무조건 arctic fox 버전을 사용해야지 auth import가 가능한걸까요?

dolphin 버전 사용하고 있는데

package com.example.fapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.ktx.Firebase


class JoinActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_join)

        auth = Firebase.auth
    }
}

마지막 firebase.auth의 auth가 import가 안되서 질문드립니다

plugins {
    id 'com.android.application' version '7.3.0' apply false
    id 'com.android.library' version '7.3.0' apply false
    id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
    id("com.google.gms.google-services") version "4.4.0" apply false
}

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id("com.google.gms.google-services")
}

android {
    namespace 'com.example.fapplication'
    compileSdk 32
    viewBinding{
        enabled true
    }

    defaultConfig {
        applicationId "com.example.fapplication"
        minSdk 24
        targetSdk 32
        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
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    dataBinding {
        enabled true
    }
}


dependencies {
    implementation("com.google.firebase:firebase-analytics-ktx")
    implementation(platform("com.google.firebase:firebase-bom:32.3.1"))
    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation("com.google.firebase:firebase-auth-ktx")
}

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.ktx.auth
import com.google.firebase.ktx.Firebase


class JoinActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_join)

        auth = Firebase.auth
    }
}