I just wondering if the timer job framework inside PnP supports server-2-server (or high) trust (like a PHA) in a on-prem installation of SharePoint 2013? I use the method "UseAppOnlyAuthentication" and provide the client ID and client secret. In the web.config the settings for the certifcate (filename, password) and the issuer ID are also set. But I still get an exception which points me to the ACS (error message: "AADSTS90002: No service namespace named").
Can anybody confirm if the timer job framework supports this scenario and give me some hints how to solve that?