After deploying Azure Database for PostgreSQL, additional steps must be performed to ensure it can be utilized by Veeam Backup for Microsoft 365.

1. Manually enable the feature PG_TRGM under azure.extensions.
   The trigram indexes extension is required for Veeam Backup for Microsoft 365 to work with the DB server.

2. Install Veeam Backup for Microsoft 365 using the PostgresSQL instance.
   The installer will generate the 'postgres' database and create the proxy user, to which you will grant the necessary permissions in the next step.
3. Connect to the PostgreSQL server and run the following query against the 'postgres' database to assign the necessary permissions to the account that will be used by the Veeam Backup for Microsoft 365 Proxy Service.