I have tested the same at my end on AEM cloud(updated the environment) and it works fine : 27.04.2021 09:59:55.445 [cm-p............d] *DEBUG* [127.0.0.1 [1619517595444] GET /libs/granite/core/content/login.html HTTP/1.1] com.ceamcdublinprogram.core.filters.LoggingFilter request for /libs/granite/core/content/login, with selector null 27.04.2021 09:59:58.089 [cm-p............d] *DEBUG* [193.104.215.11 [1619517598088] GET /bin/test/2 HTTP/1.1] com.ceamcdublinprogram.core.filters.LoggingFilter req...

Make sure we use the 'Publishing Flow' to publish all the resources by adding in the library, in the Launch console. Only then "https://assets.adobedtm.com/file-staging.json" would be available. Hope that helps. Cheers,Wasil