As a tester, to get a version number for the application as associated to that particular story in Azure DevOps...

1. Go to the story.
2. At the left under "Related Work" drill into the task the developer completed.
3. At the left under the task will be "Development" where "Related Work" used to be, drill into the individual commits here.
4. At the Overview, Files, Updates, Commits, Conflicts tabs pick "Files" and look for the file where the version number changed.