Synchronization Editor : Database Encryption not available

Hello,

I have just restored an OIM 9.2 database on a new environment (Developement).

In this database, there is a synchronization project on Active Directory.

I have edited the project and changed the URLs and parameters etc..

Then I performed a schema update.

The synchronizations works fine towards the Active Directory.

The issue is that in the Synchronization Editor I constantly get this message:
"Database Encryption not available"

Warning: "Encryption was not configured in the One Identity Manager database"

What is the meaning of this message? and how to fix it ?

Many thanks by advance.