Fix – Forbidden. There’s a problem with the flow’s trigger. Fix the trigger (Power Automate / Flow / Dataverse)

Recently we got the below error “Forbidden” for one of our flows that was using the Dataverse connection.

After some analysis, we found the root cause of the error.

The Dataverse connection reference was created using the Service Principal but it was not added as an Application User (with appropriate security role) in that environment.

Adding the corresponding Application User used for the Dataverse connection fixed the issue for us.

Hope it helps..