Geting DB2 alerts indicating that database is offline. Checked database and it is not actually offline.
Reconfigured the connection settings to accurately monitor the instances.
There was a DB2 instance that was offline (db2clnt). No agent was created for it because it was offline but the profiles.reg had the listing for it so DB Monitor agent attempted to monitor the instance.
Since the agent wasn't created, the FMS reported the offline instance against one of the other two instances. It also resolves connection issue where the installation settings are used in the connection string.