Hi @Anonymous ,
What do you mean about “poweapps admin center”? Do you mean “Power Apps make portal” as below?

Or do you mean “Power Platform admin center” as below?

I assume you want to find a specified app in the “Power Apps make portal” (first picture) based on the given App URL. From the URL you provided, I know that this URL is generated from the App’s Details screen:

Per my knowledge, we cannot find an app directly in the “Power Apps make portal” page based on Web link. Unless we check the details of each app one by one, then compare the “Web link”.
However, we can get the APP ID through the Web link. For example, your App ID is 12fe5179-cae3-474c-b605-d467409b01a9. Then we can get the App’s DisplayName using the APP ID. You can refer to my step about how to find an app based on a given URL.
1. Create a new app and add the “Power Apps for Makers” connector to data sources.

2. Add a Label and set its Text property to:
PowerAppsforMakers.GetApp("App ID").properties.displayName

I already get the DisplayName of the App, so I can go to “Power Apps make portal” page and search for this App in the upper right corner:

Best Regards,
Allen