I have a function app, I want to deploy functions into that function app

I made a CI and a CD pipeline in azure devops, all of it results in no functions in the function app

this is what my CI yaml looks like

trigger: none

pool:
  vmImage: 'windows-latest'

steps:
- task: DotNetCoreCLI@2
  inputs:
    command: 'build'
    projects: '*.csproj'
- task: DotNetCoreCLI@2
  inputs:
    command: publish
    arguments: '--configuration Release --output publish_output'
    projects: '*.csproj'
    publishWebProjects: false
    modifyOutputPath: false
    zipAfterPublish: false
- task: ArchiveFiles@2
  displayName: "Archive files"
  inputs:
    rootFolderOrFile: "$(System.DefaultWorkingDirectory)/publish_output"
    includeRootFolder: false
    archiveFile: "$(System.DefaultWorkingDirectory)/build$(Build.BuildId).zip"
- task: PublishPipelineArtifact@1
  inputs:
    targetPath: $(System.DefaultWorkingDirectory)/build$(Build.BuildId).zip
    artifactName: 'adofunc'

I believe the problem is the artifact. I have tried to download this artifact and deploy the zip using az functionapp deployment source config-zip -g <resource_group> -n <app_name> --src <zip_file_path> after setting SCM_DO_BUILD_DURING_DEPLOYMENT to true, also resulted in no functions

I manually set up another function app with functions in there, download the content from portal and compared the zip, they were very differernt

I have tried to use PublishBuildArtifacts@1 instead of PublishPipelineArtifact@1 in the pipeline, was no different, still the same old broken zip, and not having functions