Assign sub-tasks to a change of the field

[Nikola Perisic]

Hi community! I am a bit stuck and hope you can help me.

I have two automation rules:

1. First one

 

2. Second one

The goal: Based on the created sub-tasks from the first automation rule, the second automation rule that is based on any change of the Program Leaders user picker field should assign all sub-tasks to the chosen program leader. I've ticked the box on the second automation rule to be triggered when other rules are there. This project only has two rules. 

In edit work item field, I added an advanced option with the following code:
{
"fields": {
"assignee": {
"accountId": "{{issue.parent.Program Leaders.first.accountId}}"
}
}
}

What parts am I missing here? Thanks!

[Trudy Claspill]

Hello @Nikola Perisic 

In what way is the rule not doing what you want?