[Python] My boto3 code gives Success response despite of no successful updates on console

I have the following code to sign up a user on AWS cognito.

async def _sign_up(self, preferred_username: str, username: str, password: str):
'''
Sign up a user with Cognito
aram username -> user's username (either email or phone no.)
assword -> user's password
:return -> Success Response on successful signup.
'''
try:
signup_response = self._cognito_client.sign_up(
ClientId = os.getenv("AWS_COGNITO_APP_CLIENT_ID"),
Username = username,
Password = password,
UserAttributes = [{'Name': 'preferred_username', 'Value':f'{preferred_username}'}]
)

if signup_response.get('ResponseMetadata').get('HTTPStatusCode') == 200:
try:
confirm_signup_response = self._cognito_client.admin_confirm_sign_up(
UserPoolId = os.getenv("AWS_COGNITO_USER_POOL_ID"),
Username = username,
)

if confirm_signup_response.get("ResponseMetadata").get("HTTPStatusCode") == 200:

signin_response = await self._sign_in(
username = username,
password = password
)
logger.debug(signin_response)
return signin_response

except self._cognito_client.exceptions.NotAuthorizedException:
return Exception("Invalid username or password.")
except self._cognito_client.exceptions.UserNotFoundException:
return Exception("User not found.")
except self._cognito_client.exceptions.TooManyRequestsException:
return Exception("Request limit exceeded.")
except self._cognito_client.exceptions.InternalErrorException:
return Exception("Something went wrong. Please try after sometime.")
except Exception as e:
return Exception("Failed to Signin. Please try after some time.", str(e))
except self._cognito_client.exceptions.UsernameExistsException:
return Exception("The username already exists.")
except self._cognito_client.exceptions.TooManyRequestsException:
return Exception("Request limit exceeded.")
except self._cognito_client.exceptions.InternalErrorException:
return Exception("Something went wrong. Please try after sometime.")
except Exception as e:
return Exception("Failed to SignUp. Please try after some time.", str(e))


My server console shows a 200 OK response when I hit the API call. But my console doesn't show any new users. Moreover, I get an empty object as output. What can be the issue? I've checked the _cognito_client config as well. It is alright.

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