APM-PHP error rate working but not error messages

Hi, I have setup APM-PHP in our environment and everything seems to be working great except error messages are not showing up. I can see the error rate (see screenshot) but zero messages.

Elasticsearch version :
7.11.1

APM Server version :
7.12.0

Description of the problem including expected versus actual behavior. Please include screenshots (if relevant) :

Below is what I have added to my php.ini

elastic_apm.server_url=https://xxxxx.com
elastic_apm.secret_token=xxxxxxxxxxx
elastic_apm.service_name=xxxxxxx
elastic_apm.log_level=WARNING
elastic_apm.log_level_syslog=TRACE

Any ideas?

Thanks!