Using template on subsite for certain node type I am using a custom Theme in a multisite setting. With the help of @leymannx I implemented
hook_theme_suggestion_HOOK_alter to insert a page Template with the following naming convention:
page--NAMEOFSUBSITE.html.twig

See here

If I try to do the same for the node of my content type, which is using a template named node--CONTENTTYPENAME.html.twig at the moment, I can insert a name suggestion node--NAMEOFSUBSITE.html.twig, which will then be used for ALL nodes. I'd like to insert a suggestion such as
node--CONTENTYPENAME--NAMEOFSUBSITE.html.twig, for only this one nodetype.

How can I do that?

Thanx in advance!!
Activate twig debug and use the browser inspector to see the template precise name available for your content-type
Do a cache rebuild when the temaplte is created to make it happen.