Hi,
Are you using inband management for the irb interfaces. Please check:
"Which port are you using to manage the device?
- Cluster Management port (FXP0) - Continue to Step 3
- One of the revenue ports:
Note: Only the primary node can be managed using the revenue port. A revenue port is used for traffic processing"
https://kb.juniper.net/InfoCenter/index?page=content&id=KB21113&actp=search
Cheers,
Ashvin