Hello there,
I am part of the plentymarkets forum. Meanwhile also as an employee of plentymarkets. I have noticed that the subscription function does not react when a tag is inserted into a thread afterwards. It only reacts if the tag is set when creating the thread.
But I would also like to see the topics that are tagged later. What can I do?
best regards
Daniel
Friendly bump 
Je confirme que l’ajout d’un tag après la création d’un sujet ne déclenche aucune notification pour les tags suivis. Je déplace ce sujet dans la catégorie Contribute > Bug.
Hello @gerhard,
thank you for changing the category. As i have noticed, there is also the same bug when changing the category afterwards
It’s working for category changes in my tests with the latest version of Discourse.
Can we still repro this @tshenry?
No repro. Adding a tag to an existing topic successfully triggers a notification for a user watching the tag.