I created pipeline pipeline.yaml called SourcePipeline in Azure DevOps.
Narrowed down to the essential part:

stages:
  - stage: Pre-task
    displayName: 'Pre-task execution'
    jobs:
      - job: PreparationJobs
        displayName: 'Preparation Job'
        steps:   
          - script: |
              echo "$(Build.Repository.Uri)"
              echo "$(Build.SourceBranchName)"
              echo "$(Build.TriggeredBy.BuildId)"

In Azure DevOps I got some output to which I have questions:

1. For $(Build.Repository.Uri) I got vstfs:///Build/Build/298101. Why didn’t I get the full url like https://dev.azure.com//?
2. For $(Build.SourceBranch) I got test like a name of my branch. Make sense, no question.
3. For $(Build.TriggeredBy.BuildId) I got “/home/vsts/work/_temp/4y828575020.sh: line 6: Build.TriggeredBy.BuildNumber: command not found” Why? How to reveal it?

I also created the second pipeline 2pipeline.yaml called DependantPipeline in Azure DevOps.
Narrowed down to the essential part:

trigger: none

resources:
  pipelines:
  - pipeline: SourcePipeline
    source: 'SourcePipeline '
    trigger:
      branches:
        include:
          - dev/test

variables:
- name: BUILD_URI
  value: $(Build.BuildUri)
- name: PROJECT_ID
  value: $(System.TeamProjectId)
- name: TRIGGEREDBY
  value: $(Build.TriggeredBy.BuildId)
- name: BRANCH_NAME
  value: $(Build.SourceBranchName)

steps:
  - script: |
      echo "$(Build.BuildUri)"
      echo "$(Build.SourceBranchName)"
      echo "$(Build.TriggeredBy.BuildId)"

My goal is to show at least those variables which I pasted above based on the official documentation at the DependantPipeline in Azure DevOps. In this way I would know which pipeline triggered the DependantPipeline, plus several other useful information. However,

I am not able even shown that output from those variables in the origin pipeline, SourcePipeline. Nevertheless I want to see them in DependantPipeline pipeline.