I am trying to implement aws business q apis inside my own application. I am following below document provided by aws but it’s not working for chat_sync function.

https://docs.aws.amazon.com/amazonq/latest/qbusiness-ug/making-sigv4-authenticated-api-calls.html#data-plane-workflow

1. Created temporary session using AssumeRole

sts_client = boto3.client('sts')
response = sts_client.assume_role(
    RoleArn='arn:aws:iam::XXXXXXXX:role/assume_role',
    RoleSessionName='temp_sess'
)

2. Setting up the session values received from step 1.

   session = boto3.Session(
   aws_access_key_id='XXXXXXXX',
       aws_secret_access_key='XXXXXXXXXXXXXX',
       aws_session_token='XXXXXXXXXX'
   )
   
   aq_client = session.client(
       "qbusiness",
       region_name="us-east-1"
   )
   
   resp = aq_client.chat_sync(
       applicationId = "amazon-qbusiness-application-id",
       userMessage = "chat-request",
       clientToken = str(random.randint(0,10000)
   )
   

getting below error message
An error occurred (AccessDeniedException) when calling the ChatSync operation: User ID must be null and identity-aware credentials must be passed for identity-center enabled applications

After passsing userId as a parameter also it’s not working.

I have tried all the steps mentioned in the document but error is not getting resolved. Please help with the latest codebase.