php - Why is FB/Meta Conversions API not deduplicating my events even though they have the same name and eventID?

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Solution:

It seems to be working fine when using a public server instead a local one.

Then i also get the users IP-address in the server event. I guess the IP address differs between the pixel and the PHP variable $_SERVER['REMOTE_ADDR'] locally (127.0.0.1) and that is what prevents the server event to be deduplicated.