Hi @SyedAli, you should see the Flow listed on the app details page at web.powerapps.com, even if it has been added to a recently saved version that has not been published yet.
How did you add the flow to the app in your production environment? Did you manually recreate the Flow in your production environment and then add it to your app there, or did you move both the app and flow via export/import?
Are you confident that the flow was successfully added in the production environment? Are you able to successfully trigger it when previewing the unpublished app in PowerApps Studio?