Hi mingoslkd,
Thank you for your reply. That's a real shame and hopefully Apple will solve this in the future! At the moment, it is not so much that Siri detects the events (which in many cases is highly useful), but the intrusive nature of them being added automatically to my calendar without asking for them to be accepted (which is the case of all other invites that get sent to me) and of this meaning that when I delete it, an email gets sent to the organiser against my will. Even if there is something in the settings of the Microsoft Teams app, it would be ideal if Siri could anticipate and not allow this sort of behaviour to occur (and also to allow silent deletion of such invitations).
Thank you nevertheless for your answer, which answers my question.
All the best