Newbie question - ping4 in satellite zone overdue

You can use the “Preview” tab there to view the rendered config.

Correct. Only the config master should have configuration under /etc/icinga2/zones.d or /etc/icinga2/conf.d
see: Technical Concepts - Icinga 2

@Ralph please check the markdown guide for future posts to improve readability. You might also want to remove sensitive information (like fqdns) from your post.

Correct. Defining the master/satellite/global zones in the zones.conf files on the respective systems is the way to go.
Doing that in the Director can lead to problems.

As to the problem:

Both are service config from the default conf.d/services.conf file. This is basically just an example check file.

Recommendation would be to not use any of the default configs under conf.d (the icinga2 node wizard should disable the import of those files by default) and define them in the Director or move the file to the zones.d/<satellite zone> directory, that should work.