Set Assignee based on Custom Field

[Patrick]

Hi I have a custom single user picker field called "Manager" I also know the customfield ID

I want to create an automation that creates a subtask when the task transitions (thats no problem).
After that it should get the Value from Manager and Assign the new Issue to the Manager.

I can extract things like the display name, for example issue.customfield_123.displayName.
But if I put this into the Assign Action, via Smart Value is doesnt work. 
I tried .name, .value, .emailAdress

Basically how can I copy the user from Manager Custom Field to Assignee Field.

Thanks for any ideas

[Duc Thang TRAN · Accepted solution]

Hello @Patrick 

You can use this smart value for "Assgin action"

{{issue.customfield_123.accountId}} or 

{{issue.Manager.accountId}}

[Patrick]

yes this also works now, but the main issue was that the user selected in Manager couldnt be found, because he wasnt added to the project.

[Patrick]

nvm, it was my mistake : )

{{issue.customfield_123}} this was correct the problem was the user wasn't invited to the project so that why it can't be found from the assignee field. 
The customer user picker field can pick any user.