Getting a 500 internal server error when trying to send Http POST request in Postman : Creating API using Spring Boot(Java) and Mongodb Atlas

MongoDB Atlas App Services & Realm Atlas Data API
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I am creating API using Spring Boot(Java) and Mongodb Atlas, at first the project is running properly in Spring Tool Suite. But while testing in Postman, after giving Http POST request, it is showing error in both Postman and Spring Tool Suite. Beside this error there are no logical or syntax error in the project.

At First Project is running successfully in Spring Tool Suite.

While testing in Postman, Http POST request input :-

http://localhost:8080/tasks

gave input in the Body section in Postman:-

{
    "description":"Hello",
	"severity":"7",
	"assignee":"Vishwajeet",
	"storyPoint":"9"
}

Error I got in Postman:-

{
    "timestamp": "2023-07-29T06:25:21.581+00:00",
    "status": 500,
    "error": "Internal Server Error",
    "path": "/tasks"
}

And at the same moment error I got in Spring Tool Suite Console:-

com.mongodb.MongoCommandException: Command failed with error 8000 (AtlasError): 'bad auth : authentication failed'

com.mongodb.MongoCommandException: Command failed with error 8000 (AtlasError): 'bad auth : authentication failed' on server ac-vp821t7-shard-00-01.ghalbag.mongodb.net:27017. The full response is {"ok": 0, "errmsg": "bad auth : authentication failed", "code": 8000, "codeName": "AtlasError"}
	at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:205) ~[mongodb-driver-core-4.9.1.jar:na]
	at com.mongodb.internal.connection.InternalStreamConnection.

Some files from my Project:-

application.yml

spring:
  data:
    mongodb:
      uri: mongodb+srv://admin:<admin>@vishwajeet.ghalbag.mongodb.net/?retryWrites=true&w=majority
      database: Task

POM.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.1.2</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.Test</groupId>
	<artifactId>Spring-boot-test</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>Spring-boot-test</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>17</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-mongodb</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!--
		https://mvnrepository.com/artifact/de.flapdoodle.embed/de.flapdoodle.embed.mongo -->
		<dependency>
			<groupId>de.flapdoodle.embed</groupId>
			<artifactId>de.flapdoodle.embed.mongo</artifactId>
			<version>4.3.1</version>
			<scope>test</scope>
		</dependency>


		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<excludes>
						<exclude>
							<groupId>org.projectlombok</groupId>
							<artifactId>lombok</artifactId>
						</exclude>
					</excludes>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

Controller.java

package com.example.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import com.example.entity.Task;
import com.example.service.TaskService;

@RestController
@RequestMapping("/tasks")
public class TaskController {

	@Autowired
	private TaskService service;

	@PostMapping
	@ResponseStatus(HttpStatus.CREATED)
	public Task createTask(@RequestBody Task task) {
		// give task as input from the postman
		// I will pass this value from Postman,
		// json will be converted to java object using Jackson databind
		return service.addTask(task);
	}

	@GetMapping
	public List<Task> getTasks() {
		return service.findAllTask();

	}

	@GetMapping("/taskId")
	public Task getTask(@PathVariable String taskId) {
		return service.getTaskByTaskId(taskId);
	}

	@GetMapping("/severity/{severity}")
	public List<Task> findtaskUsingSeverity(@PathVariable int severity) {
		return service.getTaskBySeverity(severity);
	}

	@GetMapping("/assignee/{assignee}")
	public List<Task> findTaskByAsignee(@PathVariable String assignee) { // SAME method name
		return service.getTaskByAsignee(assignee);

	}

	@PutMapping
	public Task modifyTask(@RequestBody Task task) {
		return service.updateTask(task);
	}

	@DeleteMapping
	public String deleteTask(String taskId) { // SAME method name
		return service.DeleteTask(taskId);
	}
}