My app took 2+ days to show up in Admob. Wait, it will show up.If your app name is a bit too common (like mine was "memes") - I would recommend to search by developer name. Admob will try to list all apps of that developer.
Instead of APP name if you provide Developer name ,then it will show of list all APPs by the developer.Then select your required APP [which was not listed when searched].Enjoy !!!!