Invalid Time Zone ID

Hi dear friends.

I have an issue when running my flow to convert the Time Zone.

It works fine sometimes, but also failed at the same time. So I am wondering what's going wrong here.

The error message is always
Unable to process template language expressions in action 'Compose_-_End_Date' inputs at line '0' and column '0': 'In the template language function 'convertTimeZone', the value provided for the time zone id 'Asia/Kuala_Lumpur' was not valid. '.

I have changed according to its suggestion for many times, but it still failed saying that the time zone id I changed is incorrect, although suggested by Microsoft.

It sounds much more ridiculous with the suggestion this round.

This is my expression. I am located in Kuala Lumpur Malaysia, GMT+8. This action is for me to block the calendar whenever an employee apply for time off. But due to timezone issue, if let say the employee will away from 27 -29 Sep 2024, the calendar will only block till 28 Sep, missing out 1 day. So I am using this expression to prolong the time to 29 Sep 2024.

 
formatDateTime(convertTimeZone(addHours(outputs('Get_response_details')?['body/rae1b263dd3cd4d59b8a18abc4abafafe'], 15), 'UTC', 'Singapore Standard Time'), 'yyyy-MM-ddTHH:mm:ss')
 
Appreciate it is someone could solve my issue!