No tracking data after Install on Drupal (matomo cloud)

Hi,
I’ve just registered for matomo cloud and installed the module on my Drupal 10 installation as described by matomo (site ID etc.).
Now there is no data showing up, nither on the dashoboard of matomo cloud nor in the Matomo Reports module on my site.
Any Ideas how to get it working?

As an alternative to the module, where should I place the tracking code on a Drupal 10 installation?

Thanks!
P.