@Abedin, Masood Thanks for providing additional information
Are you using a tumbling window? if yes you can follow the steps from this link
from the pipeline go to Edit trigger and from there go to trigger run parameters as shown below
This splits a trigger and assigns values to the pipeline parameter corresponding to the triggers window. Now you do not need to assign a default value to the pipeline parameter.
The format looks like "2023-03-16T19:46:00Z"
If you are not using a tumbling window do not try to evaluate expression in the pipeline parameter. insted either use a veriable or evaluate directly filter like shown below.
use trigger time insted of utcnow for greater consistency, refer to this link for more information.
Regards
Geetha