Custom event trigger with _mtm doesn't work

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21

Thanks Philippe for your note. You’re right.
Am testing in a debug mode and in fact the problem is the name of the data layer which is dataLayer with GTM and _mtm with Matomo. That difference may cause trouble with some scripts.

22

Have a look at:
https://matomo.org/docs/tag-manager
and:
https://matomo.org/faq/tag-manager

23

Thanks,
I found the solution.
It was the difference between GTM and Matomo Tag Manager called datalayer by GTM and mtm_ by MTM.
Thanks again for your help.