Solved! Go to Solution.
I'd start by checking this page: https://www.dynatrace.com/support/help/how-to-use-dynatrace/real-user-monitoring/setup-and-configura...
To see 1) if any of those are being blocked and 2) if you're seeing any sign that injection is being attempted at all. In browser developer tools you should be able to see any of the indications (headers, cookies, etc...).
@rmeli Did anyone identify a root cause here. We are experiencing issues with our RUM rules. The number of session that we are seeing is extremely low in comparison to the traffic should be reporting in.