You already posted a question about the same topic I think, did you try the UEm healtcheck I suggested there? https://answers.dynatrace.com/spaces/148/uem-open-q-a_2/questions/182616/in-sap-netweaver-dynatrace-java-script-injected-au.html
Ah, okay. So that is not the agent being loaded but the UEM data being send home.
What happens if you manually open the /dynaTraceMonitor request path in the browser, is it working there?
I still would try the UEM Health check I suggested.
You can chagne the /dynaTraceMonitor request path in the System Profile -> User Experience Settings. Here is an example for one of our applications where I changed it: