Hi @jumma. Make sure that your certificates in Charles are set up appropriately:
If you see red Xs in Charles, it means your certificates are not set up correctly.
After you follow the setup steps in https://community.tealiumiq.com/t5/Universal-Data-Hub/Trace/ta-p/12058#toc-hId-1612772743, check that Charles is actually rewriting your request. For example, in the i.gif request that is sent, if you look at the Overview tab, check that your Notes field in Charles says, "Rewrite Tool: body match...". This means that Charles correctly rewrote and added the "cp.trace_id":"<your-trace-number>" correctly. If the cp.trace_id is part of the request, you should be seeing your events in Trace.
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