Automation with GitHub: how can I assign a user as as reviewer for a pull request?

[ekrikelis]

 I have created a set of automation rules with GitHub webhook. When the automation rule tries to assign a user to review a pull request with a smart value {{webhookData.pull_request.requested_reviewers.login}}, I get the error "Specified user does not exist or you do not have required permission". The public name of the user and the full name are exact matches of the GitHub name. It is not a permissions issue because when I assign manually a user in the web interface I get no issues about permissions. Can anyone help with this?

[Riaan van Rooyen]

Another request for this, I am looking to automate the transition of jira issues to In Review/Under Review and Closed based of of Pull Request triggers, but I am also hoping to assign the reviewer as the assignee of the issue when moving to In Review on Pull Request created.

Any leads? 

[Harris Harijono]

I am also looking for an answer to this question. Did you manage to solve this problem?