Issue regarding accepted time of task in task report


I am working on version 21.2. 

I have a scenario, wherein I want my task report to display the "Task Accepted Time".

I am using the function:


When I am calling this function in an expression rule, the rule is running fine and giving the date and time as per the task id passed. However, when I call this rule in the task report and pass tp!id, the value of the column remains blank. Also if I directly call this function in the task report, the value of column remains blank.

Can any one please help me with this issue.

Thanks in advance!!

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