19c data guard switch over

Hi
We have a 2 node 19c (19.11.0.0.0) primary and standby RAC database
We are starting a process to test the switch over from primary to standby 

We used 

$ dgmgrl /

Connected to "proddb"

Connected as SYSDG.

DGMGRL> validate database 'proddb';

  Database Role:    Primary database

  Ready for Switchover:  Yes

  Flashback Database Status:

    proddb:  Off

  Managed by Clusterware:

    proddb:  NO

    Warning: Ensure primary database's StaticConnectIdentifier property

    is configured properly so that the primary database can be restarted

    by DGMGRL after switchover

Can someone please explain as to what does this Warning entail? Do we need to configure something before we can perform a switch over?