Creating x amount of rows in related table when a Row is Added

[Arshavince]

Hi there, 

I am making a model-driven app and have two main tables:

1) a custom table for "requests" with a required field "workers required" that is used to indicate how many people it will take to complete the request

2) a task table where the tasks are assigned to workers.

When I create a new request, upon pressing save I would like Power Automate to create [workers required] amount of tasks in the task table, and preferably to set the task's subject to "Task Y of Z - [request name]"

When I try to add the Request ID ("Unique Identifier for entity instances") to the regarding field, it fails with the following error: 

"URL was not parsed due to an ODataUnrecognizedPathException. Resource not found for the segment provided in the URL."

I feel like the problem is getting it to link to the regarding field... Is there a different field I'm supposed to use to populate the task's regarding field?