Hi Shreya
The app might have already removed from Managed Play store. Intune usually leaves the entry so that the app can be assigned to Uninstall from user devices. Details below
If an app is unapproved or deleted from the managed Google Play store, it will not be removed from the Intune client apps list. This allows you to still target an uninstall policy to users even if the app is unapproved.
Please mark this as answer , if this helps!
Cheers!
Aravinth M