ACC device agent not running

Hello,

Got this message from our UTM in HA:

To: XXXX
Subject: [XXXX ][XXXX] ACC device agent not running - restarted
ACC device agent not running - restarted
--
HA Status : HA MASTER (node id: 1)
System Uptime : 52 days 23 hours 45 minutes
System Load : 1.48
System Version : Sophos UTM 9.210-20

Please refer to the manual for detailed instructions.

What does is mean? What is a possible source of this message and how to possible resolve?

Thanks