Firebase Cloud Functions Firestore Trigger produces: Error: 7 PERMISSION_DENIED: Missing or insufficient permissions

Question

I\'m trying to use a Firebase Cloud Function to update a document within my Firestore database, when one of my documents has been updated using a trigger. The trigger is cal

Answer 1

I've finally got it working. I didn't change any firestore security rules nor any IAM stuff. I deleted the function which was running on us-central1. Created the same Cloud Function project again, copied over my existing code, but this time I deployed it to europe-west1 and it worked out of the box.

I assume that something might failed during the first initial deployment to us-central1 and after that my project stuck with the error even if I had deleted and redeployed the function several times. Not sure what happened exactly, because no obvious error has been displayed. Maybe someone of the firebase team who knows the internal workflows can tell us if something like this can happen and if yes, how to deal with it.

For now the above steps solved my issue.