What could went wrong if the "cloud messages" data are not exported from Firebase to BigQuery anymore?

Question

Cloud messages (push notices) sent with Firebase to my app users was exported to BigQuery - so I can get stats about that. It was loaded in firebase_messaging table on BigQuery. In short - it was working for few months and now it stopped since last week.

I have checked:

• Integrations section in Firebase console - BigQuery is still linked with my apps.
• If apps was updated before sync stopped - no, there was no changes.
• If anything changed in push notification structure (sent from backend) - no, the same for all notifications since few weeks
• Limits are not exceeded

Answer 1

SOLVED: Despite the fact that it is a free plan - it somehow requires an assigned credit card (e.g.)