After upgrading an SRX HA pair, a chassis alarm for "SMS Channel Down" is triggered and remains present, though no cloud connectivity issues detected.

root@SRX_LAB> show chassis alarms no-forwarding

1 alarms currently active

Alarm time        Class Description

2024-05-23 04:45:59 UTC Minor SMS submission channel down, session will be skipped by SMS inspection

Upgrade to one of the following Junos version:
21.1R3-S4
21.2R3-S3
21.4R3-S1
22.1R3
22.2R2
22.3R2
22.4R1

Workaround:
Failover of Redundancy Group 0 to standby node clears alarm.
NOTE: RG0 failovers are recommended during MW due to possible traffic impact during dynamic-routing restart.

https://prsearch.juniper.net/problemreport/PR1629972