How to accept a Teams meeting in Fantastical

I’m unable to accept a Microsoft Teams or Zoom meeting event on my Mac/Ipad.
If i open the invite in apple mail I can select accept/maybe/reject. Once I accept the invite, it does not appear in my calendar (fantstical nor the apple calendar).
Has anyone the same issue, or solved this issue?
I have no clue how to correct this.

I believe that is a feature of Fantastical premium. Do you have the premium subscription?

Yes, I do have a premium subscription.