Can't deploy MEAN stack app to Azure App Service via pipeline - node.js

Question

I'm unable to deploy my app to azure app service. I've created a pipeline that fails at the azure app service deploy stage. I've been trying to get this working for a few days now. I've finally gotten it past the deploy app stage, but it just says Application Error when I click URL? and I configure it to point to the correct subscription. Web App for Linux, then chose the app-service call gc-dev, but I get errors still. I also get the same application error when trying to deploy app from vscode. It's possible both deployment types are dealing with exact same issue. IDK though.
I feel like it has something to do with the startup command since nothing is calling ng serve to launch angular code, but I'm not sure. Another thing that might be relevant to the issue is that all my angular services still have http://localhost:3000/api/ instead of some cloud url. Not sure if that's the issue with the inital page load though. I feel like it should still at least load the login screen. I appreciate any help!
Deploy Stage
The steps are as follows:
steps:
- task: Npm#1
displayName: 'install the #anguliar/cli'
inputs:
command: custom
workingDir: glass/
verbose: false
customCommand: 'install #angular/cli -g'
steps:
- task: Npm#1
displayName: 'install the project'
inputs:
workingDir: glass/
verbose: false
steps:
- task: Npm#1
displayName: 'build project'
inputs:
command: custom
workingDir: my-app/
verbose: false
customCommand: 'run build'
steps:
- task: Npm#1
displayName: 'npm install the dist/folder for express'
inputs:
workingDir: my-app/dist/
verbose: false
steps:
- task: Npm#1
displayName: 'Build the project'
inputs:
command: custom
workingDir: my-app
verbose: false
customCommand: 'run build'
steps:
- task: AzureRmWebAppDeployment#4
displayName: 'Azure App Service Deploy: my-app dev'
inputs:
azureSubscription: 'Azure subscription 1 (99c421dc-5cf5-444c-8df5-c71[![enter image description here][2]][2]02)'
appType: webAppLinux
WebAppName: 'gc-dev'
packageForLinux: my-app
WebConfigParameters: '-Handler iisnode -NodeStartFile index.js -appType node'
enableCustomDeployment: true
TakeAppOfflineFlag: false

Answer 1

Well, for one thing, this cannot be correct:
WebAppName: 'My-app - Dev'
You can't have spaces in App Service app names. It's part of the default URL.