Same here. Trigger works for a few days then stops. There are no error logs. I have app registered in azure with all credentials (please note that trigger does work at the beginning, but after couple days it stops). I also registered weebhook url on teams team. Still The same.
When you add teams trigger and setup everything try:
and use https://graph.microsoft.com/v1.0/subscriptions
this will show you active subsriptions (this is something that teams use to notify n8n about new message). You should be able to see your subscription somewhere on that list.
But if you dig bit more there will be also something like:
expirationDateTime
and this is why our nodes work and after a while stops. Because our subcriptions expires. I am not sure if it is possible to refresh if somehow. But maybe this will enough hint for someone else to help all of us with that.
Maybe it is strictly related with those mentioned permission. I also saw that
creatorId
is pointing on my user ID instead of n8n app.