SCM user not authorized while invoking private job from pipeline

Summary:

We have multiple jobs in pipelines and approval step, post approval step need to invoke private job. When it invokes private job it throws error message "User SCM is not authorized to run job". However, I am not able to find SCM user to add authorized user in Job Protection. It seems SCM user is internal user for Visual Builder Studio.

Please let me know how to add SCM user to Authorized user or any other options to execute private job from pipeline.

Content (please ensure you mask any confidential information):

Pipeline work flow

First Job initiated by auto commit on Git repo and post approval next job needs to be triggered.